32;Identification;Identification of the organization.

33;Name;The word, or group of words, by which the organization is referred to.

34;Description;Text that relates the nature of the organization.

35;Roles;Roles played by the organization.

36;Addresses;"<EPM-HTML>

Postal and telecom addresses of an organization.

<blockquote><small>NOTE: There may be several addresses related to an organization.

</small></blockquote>

</EPM-HTML>"

37;IsRelatedBy;The inverse relationship for relationship RelatedOrganizations of IfcOrganizationRelationship.

38;Relates;The inverse relationship for relationship RelatingOrganization of IfcOrganizationRelationship.

39;Engages;Inverse relationship to IfcPersonAndOrganization relationships in which IfcOrganization is engaged.

41;Role;"The name of the role played by an actor. If the Role has value USERDEFINED, then

the user defined role shall be provided as a value of the attribute UserDefinedRole."

42;UserDefinedRole;"Allows for specification of user defined roles beyond the

enumeration values provided by Role attribute of type IfcRoleEnum.

When a value is provided for attribute UserDefinedRole in parallel

the attribute Role shall have enumeration value USERDEFINED."

43;Description;A textual description relating the nature of the role played by an actor.

44;HasExternalReference;"<EPM-HTML>

Reference to external information, e.g. library, classification, or document information, which is associated with the actor role.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE New inverse attribute.

</font>

</small>

</blockquote>

</EPM-HTML>"

73;Purpose;Identifies the logical location of the address.

74;Description;Text that relates the nature of the address.

75;UserDefinedPurpose;"Allows for specification of user specific purpose of the address beyond the

enumeration values provided by Purpose attribute of type IfcAddressTypeEnum.

When a value is provided for attribute UserDefinedPurpose, in parallel the

attribute Purpose shall have enumeration value USERDEFINED."

76;OfPerson;The inverse relationship to Person to whom address is associated.

77;OfOrganization;The inverse relationship to Organization to whom address is associated.

80;InternalLocation;An organization defined address for internal mail delivery.

81;AddressLines;"<EPM-HTML>

The postal address.

<blockquote><small>NOTE: A postal address may occupy several lines (or elements) when recorded.

It is expected that normal usage will incorporate relevant elements of the following address concepts:

A location within a building (e.g. 3rd Floor) Building name (e.g. Interoperability House) Street number

(e.g. 6400) Street name (e.g. Alliance Boulevard). Typical content of address lines may vary in different

countries.

</small></blockquote>

</EPM-HTML>"

82;PostalBox;An address that is implied by an identifiable mail drop.

83;Town;The name of a town.

84;Region;"<EPM-HTML>

The name of a region.

<blockquote><small>NOTE: The counties of the United Kingdom and the states of North America are examples of regions.

</small></blockquote>

</EPM-HTML>"

85;PostalCode;The code that is used by the country's postal service.

86;Country;The name of a country.

89;TelephoneNumbers;The list of telephone numbers at which telephone messages may be received.

90;FacsimileNumbers;The list of fax numbers at which fax messages may be received.

91;PagerNumber;The pager number at which paging messages may be received.

92;ElectronicMailAddresses;The list of Email addresses at which Email messages may be received.

93;WWWHomePageURL;"<EPM-HTML>

The world wide web address at which the preliminary page of information for the person or organization can be located.

<blockquote><small>NOTE: Information on the world wide web for a person or organization may be separated

into a number of pages and across a number of host sites, all of which may be linked together. It is assumed that

all such information may be referenced from a single page that is termed the home page for that person or organization.

</font></blockquote>

</EPM-HTML>"

94;MessagingIDs;IDs or addresses for any other means of telecommunication, for example instant messaging, voice-over-IP, or file transfer protocols. The communication protocol is indicated by the URI value with scheme designations such as irc:, sip:, or ftp:.

103;Identification;Identification of the person.

104;FamilyName;"<EPM-HTML>

The name by which the family identity of the person may be recognized.

<blockquote><small>NOTE: Depending on geographical location and culture, family name may appear either as the first or last component of a name.</small></blockquote>

</EPM-HTML>"

105;GivenName;"<EPM-HTML>

The name by which a person is known within a family and by which he or she may be familiarly recognized.

<blockquote><small>NOTE: Depending on geographical location and culture, given name may appear either as the first or last component of a name.</small></blockquote>

</EPM-HTML>"

106;MiddleNames;"<EPM-HTML>

Additional names given to a person that enable their identification apart from others who may have the same or similar family and given names.

<blockquote><small>NOTE: Middle names are not normally used in familiar communication but may be asserted to provide additional

identification of a particular person if necessary. They may be particularly useful in situations where the person concerned has a

family name that occurs commonly in the geographical region.

</small></blockquote>

</EPM-HTML>"

107;PrefixTitles;The word, or group of words, which specify the person's social and/or professional standing and appear before his/her names.

108;SuffixTitles;The word, or group of words, which specify the person's social and/or professional standing and appear after his/her names.

109;Roles;Roles played by the person.

110;Addresses;"<EPM-HTML>

Postal and telecommunication addresses of a person.

<blockquote><small>NOTE - A person may have several addresses.

</small></blockquote>

</EPM-HTML>"

111;EngagedIn;The inverse relationship to IfcPersonAndOrganization relationships in which IfcPerson is engaged.

114;ThePerson;The person who is related to the organization.

115;TheOrganization;The organization to which the person is related.

116;Roles;"<EPM-HTML>

Roles played by the person within the context of an organization. These may differ from the roles in <i>ThePerson.Roles</i> which may be asserted without organizational context.

</EPM-HTML>"

118;Name;The word or group of words by which the relationship is referred to.

119;Description;Text that relates the nature of the relationship.

120;RelatingOrganization;Organization which is the relating part of the relationship between organizations.

121;RelatedOrganizations;The other, possibly dependent, organizations which are the related parts of the relationship between organizations.

124;Identifier;A computer interpretable identifier by which the approval is known.

125;Name;A human readable name given to an approval.

126;Description;"A general textual description of a design, work task, plan, etc. that is being approved for. "

127;TimeOfApproval;"<EPM-HTML>

Date and time when the result of the approval process is produced.

<blockquote>

<p>

<span style=""font-size:smaller;color:red"">

IFC2x4 CHANGE&nbsp; Attribute data type changed to <i>IfcDateTime</i> using ISO 8601 representation, renamed from ApprovalDateTime and made OPTIONAL.

</span>

</p>

</blockquote>

</EPM-HTML>"

128;Status;The result or current status of the approval, e.g. Requested, Processed, Approved, Not Approved.

129;Level;Level of the approval e.g. Draft v.s. Completed design.

130;Qualifier;Textual description of special constraints or conditions for the approval.

131;RequestingApproval;"<EPM-HTML>

The actor that is acting in the role specified at <em>IfcOrganization</em> or individually at <em>IfcPerson</em> and requesting an approval.

<blockquote>

<p>

<span style=""font-size:smaller;color:red"">

IFC2x4 CHANGE&nbsp; New attribute for approval request replacing IfcApprovalActorRelationship (being deleted).

</span>

</p>

</blockquote>

</EPM-HTML>"

132;GivingApproval;"<EPM-HTML>

The actor that is acting in the role specified at <em>IfcOrganization</em> or individually at <em>IfcPerson</em> and giving an approval.

<blockquote>

<p>

<span style=""font-size:smaller;color:red"">

IFC2x4 CHANGE&nbsp; New attribute for approval provision replacing IfcApprovalActorRelationship (being deleted).

</span>

</p>

</blockquote>

</EPM-HTML>"

133;HasExternalReferences;"<EPM-HTML>

Reference to external references, e.g. library, classification, or document information, that are associated to the Approval.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE New inverse attribute.

</font>

</small>

</blockquote>

</EPM-HTML>"

134;ApprovedObjects;Reference to the <i>IfcRelAssociatesApproval</i> instances associating this approval to objects (subtypes of <i>IfcRoot</i>

135;ApprovedResources;The set of relationships by which resource objects that are are approved by this approval are known.

136;IsRelatedWith;The set of relationships by which this approval is related to others.

137;Relates;The set of relationships by which other approvals are related to this one.

140;RelatingApproval;The approval that other approval is related to.

141;RelatedApprovals;"The approvals that are related to another (relating) approval.<blockquote><small><font color=""#FF0000"">IFC2x Edition 4 CHANGE The cardinality of this attribute has been changed to SET.</font></small></blockquote>"

143;RelatedResourceObjects;"<EPM-HTML>

Resource objects that are approved.

</EPM-HTML>"

144;RelatingApproval;The approval for the resource objects selected.

147;LifeCyclePhase;Describes the applicable building life-cycle phase. Typical values should be DESIGNDEVELOPMENT, SCHEMATICDEVELOPMENT, CONSTRUCTIONDOCUMENT, CONSTRUCTION, ASBUILT, COMMISSIONING, OPERATION, etc.

148;PredefinedType;"<EPM-HTML>

Predefined generic type for a performace history that is specified in an enumeration.

<blockquote>

<small><font color=""#ff0000"">IFC2x4 CHANGE The attribute has been added at the end of the entity definition.</font>

</small>

</blockquote>

</EPM-HTML>"

153;RelatingApproval;Reference to approval that is being applied using this relationship.

155;Intent;The intent of the constraint usage with regard to its related IfcConstraint and IfcObjects, IfcPropertyDefinitions or IfcRelationships. Typical values can be e.g. RATIONALE or EXPECTED PERFORMANCE.

156;RelatingConstraint;Reference to constraint that is being applied using this relationship.

158;ApplicableDates;"<EPM-HTML>Defines an ordered list of the dates for which the time-series data are applicable. For example, the definition of all public holiday dates for a given year (as a list of <i>IfcDate</i>) allows the formulation of a ""holiday"" occupancy schedule from overall occupancy data.

<blockquote> <font color=""#FF0000"" SIZE=""-1"">IFC2x2 Addendum 1 CHANGE: The attribute has been changed to be optional </font></blockquote>

<blockquote><small><font color=""#FF0000"">Note IFC2x Edition 4 CHANGE: New underlying type <i>IfcDate</i> using ISO 8601 representation.</font></small></blockquote>

</EPM-HTML>"

159;TimeSeriesScheduleType;Defines the type of schedule, such as DAILY, WEEKLY, MONTHLY or ANNUALLY.

160;TimeSeries;The time series is used to represent the values at discrete points in time that define the schedule. For example, a 24-hour occupancy schedule would be a regular time series with a start time at midnight, end time at (the following) midnight, and with 24 values indicating the occupancy load for each hour of the 24-hour period.

163;PredefinedType;Subtype of pile.

175;PredefinedType;Subtype of footing.

186;PredefinedType;Indicates the kind of surface feature.

195;PredefinedType;Qualifies the feature regarding its shape and configuration relative to the voided element.

207;PredefinedType;"<EPM-HTML>

The generic type of the footing.

<blockquote><font color=""#0000ff"" size=""-1"">IFC 2x4 change:&nbsp; Attribute made optional. Type information can be provided by <i>IfcRelDefinesByType</i> and <i>IfcFootingType</i>.</font></blockquote>

</EPM-HTML>"

211;PredefinedType;"<EPM-HTML>

The predefined generic type of the pile according to function.

<blockquote><font color=""#0000ff"" size=""-1"">IFC 2x4 change:&nbsp; Attribute made optional. Type information can be provided by <i>IfcRelDefinesByType</i> and <i>IfcPileType</i>.</font></blockquote>

</EPM-HTML>"

212;ConstructionType;"<EPM-HTML>

General designator for how the pile is constructed.

<blockquote><font color=""#0000ff"" size=""-1"">IFC 2x4 change:&nbsp; Material profile association capability by means of <i>IfcRelAssociatesMaterial</i> has been added. The attribute <i>ConstructionType</i> should not be used whenever its information can be provided by a material profile set, either associated with the <i>IfcPile</i> object or, if present, with a corresponding instance of <i>IfcPileType</i>.</font></blockquote>

</EPM-HTML>"

225;PredefinedType;Subtype of reinforcement element.

226;BendingShapeCode;"<EPM-HTML>

Shape code per a standard like ACI 315, ISO 3766, or a similar standard. It is presumed that a single standard for defining the bar bending is used throughout the project and that this standard is referenced from the <i>IfcProject</i> object through the <i>IfcDocumentReference</i> mechanism.

</EPM-HTML>"

227;BendingParameters;Bending shape parameters. Their meaning is defined by the bending shape code and the respective standard.

233;PredefinedType;Subtype of reinforcement element.

234;Role;The role, purpose or usage of the reinforcement, i.e. the kind of loads and stresses it is intended to carry. Standard values are 'Main', 'Shear', 'Ligature', 'Stud', 'Punching', 'Edge', 'Ring'.

238;PredefinedType;The predefined type is always BAR.

250;PredefinedType;The predefined type is always MESH.

253;NominalDiameter;The nominal diameter defining the cross-section size of the reinforcing bar.

254;CrossSectionArea;The effective cross-section area of the reinforcing bar.

255;BarLength;"The total length of the reinforcing bar. The total length of bended bars are calculated according to local standards with corrections for the bends."

256;BarSurface;"Indicator for whether the bar surface is plain or textured."

257;PredefinedType;The predefined type is always BAR.

259;MeshLength;The overall length of the mesh measured in its longitudinal direction.

260;MeshWidth;The overall width of the mesh measured in its transversal direction.

261;LongitudinalBarNominalDiameter;The nominal diameter denoting the cross-section size of the longitudinal bars.

262;TransverseBarNominalDiameter;The nominal diameter denoting the cross-section size of the transverse bars.

263;LongitudinalBarCrossSectionArea;The effective cross-section area of the longitudinal bars of the mesh.

264;TransverseBarCrossSectionArea;The effective cross-section area of the transverse bars of the mesh.

265;LongitudinalBarSpacing;"The spacing between the longitudinal bars. Note: an even distribution of bars is presumed; other cases are handled by classification or property sets."

266;TransverseBarSpacing;"The spacing between the transverse bars. Note: an even distribution of bars is presumed; other cases are handled by classification or property sets."

267;PredefinedType;The predefined type is always MESH.

272;DefinitionType;Descriptive type name applied to reinforcement definition properties.

273;ReinforcementSectionDefinitions;The list of section reinforcement properties attached to the reinforcement definition properties.

285;Name;"<EPM-HTML>

The string by which the pre defined item is identified. Allowable values for the string are declared at the level of subtypes.

</EPM-HTML>"

293;FontFamily;"<EPM-HTML>

The value is a prioritized list of font family names and/or generic family names. The first list entry has the highest priority, if this font fails, the next list item shall be used. The last list item should (if possible) be a generic family.<br>

</EPM-HTML>"

294;FontStyle;"<EPM-HTML>

The font style property selects between normal (sometimes referred to as ""roman"" or ""upright""), italic and oblique faces within a font family.<br>

</EPM-HTML>"

295;FontVariant;"<EPM-HTML>

The font variant property selects between normal and small-caps.

<blockquote> <small>NOTE&nbsp; It has been introduced for later compliance to full CSS1 support.</small></blockquote>

</EPM-HTML>"

296;FontWeight;"<EPM-HTML>

The font weight property selects the weight of the font.

<blockquote> <small>NOTE&nbsp; Values other then 'normal' and 'bold' have been introduced for later compliance to full CSS1 support.</small></blockquote>

</EPM-HTML>"

297;FontSize;"<EPM-HTML>

The font size provides the size or height of the text font.

<blockquote> <small>NOTE&nbsp; The following values are allowed, <<i>IfcLengthMeasure<i>, with positive values, the length unit is globally defined at <i>IfcUnitAssignment</i>.</small></blockquote>

</EPM-HTML>"

309;Name;"<EPM-HTML>

Optional name given to a particular colour specification in addition to the colour components (like the RGB values).

<blockquote><small>

NOTE&nbsp; Examples are the names of a industry colour classification, such as RAL.<br>

<font color=""#FF0000"">IFC2x Edition 3 CHANGE&nbsp; Attribute added.

</font></small></blockquote>

</EPM-HTML>"

311;Red;"<EPM-HTML>

The intensity of the red colour component.

<blockquote><small>

NOTE&nbsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.

</small></blockquote>

</EPM-HTML>"

312;Green;"<EPM-HTML>

The intensity of the green colour component.

<blockquote><small>

NOTE&nbsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.

</small></blockquote>

</EPM-HTML>"

313;Blue;"<EPM-HTML>

The intensity of the blue colour component.

<blockquote><small>

NOTE&nbsp; The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.

</small></blockquote>

</EPM-HTML>"

316;SizeInX;"<EPM-HTML>

The extent in the direction of the x-axis.

</EPM-HTML>"

317;SizeInY;"<EPM-HTML>

The extent in the direction of the y-axis.

</EPM-HTML>"

319;Placement;"<EPM-HTML>

The <i>IfcAxis2Placement</i> positions a local coordinate system for the definition of the rectangle. The origin of this local coordinate system serves as the lower left corner of the rectangular box.

<blockquote> <small>NOTE&nbsp; In case of a 3D placement by <i>IfcAxisPlacement3D the <i>IfcPlanarBox</i> is defined within the xy plane of the definition coordinate system.</small></blockquote>

</EPM-HTML>"

325;DependingProperty;"<EPM-HTML>

The property on which the relationship depends.

</EPM-HTML>"

326;DependantProperty;"<EPM-HTML>

The dependant property.

</EPM-HTML>"

327;Expression;Expression that further describes the nature of the dependency relation.

332;Name;"<EPM-HTML>

Name for this property. This label is the significant name string that defines the semantic meaning for the property.

</EPM-HTML>"

333;Description;"<EPM-HTML>

Informative text to explain the property.

</EPM-HTML>"

334;PartOfPset;"<EPM-HTML>

Reference to the <i>IfcPropertySet</i> by which the <i>IfcProperty</i> is referenced.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; New inverse attribute to navigate from <i>IfcProperty</i> to <i>IfcPropertySet</i> with upward compatibility for file based exchange.

</font>

</small>

</blockquote>

</EPM-HTML>"

335;HasExternalReferences;"<EPM-HTML>

Reference to an external reference, e.g. library, classification, or document information, that is associated to the property.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE New inverse attribute.

</font>

</small>

</blockquote>

</EPM-HTML>"

336;PropertyForDependance;The property on whose value that of another property depends.

337;PropertyDependsOn;The relating property on which the value of the property depends.

338;PartOfComplex;"<EPM-HTML>

Reference to the <i>IfcComplexProperty</i> in which the <i>IfcProperty</i> is contained.

<blockquote><small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The cardinality has changed to 0..n to allow reuse of instances of <i>IfcProperty</i> in several <i>IfcComplexProperty</i> with upward compatibility for file based exchange.

</font></small></blockquote>

</EPM-HTML>"

340;UsageName;"<EPM-HTML>Usage description of the <I>IfcComplexProperty</I> within the property set which references the <I>IfcComplexProperty</I>.

<BLOCKQUOTE> <FONT SIZE=""-1"">NOTE: Consider a complex property for glazing properties. The <I>Name</I> attribute of the <I>IfcComplexProperty</I> could be <I>Pset_GlazingProperties</I>, and the UsageName attribute could be <I>OuterGlazingPane</I>.</FONT></BLOCKQUOTE>

</EPM-HTML>"

341;HasProperties;"<EPM-HTML>

Set of properties that can be used within this complex property (may include other complex properties).

</EPM-HTML>"

352;NominalValue;"<EPM-HTML>

Value and measure type of this property.

<blockquote><small>

NOTE&nbsp; By virtue of the defined data type, that is selected from the SELECT <i>IfcValue</i>, the appropriate unit can be found within the <i>IfcUnitAssignment</i>, defined for the project if no value for the unit attribute is given.<br>

<font color=""#ff0000"">

IFC2x3 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange.

</font>

</small></blockquote>

</EPM-HTML>"

353;Unit;Unit for the nominal value, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject.

355;EnumerationValues;"<EPM-HTML>

Enumeration values, which shall be listed in the referenced <i>IfcPropertyEnumeration</i>, if such a reference is provided.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

356;EnumerationReference;Enumeration from which a enumeration value has been selected. The referenced enumeration also establishes the unit of the enumeration value.

359;Name;Name of this enumeration.

360;EnumerationValues;List of values that form the enumeration.

361;Unit;Unit for the enumerator values, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject.

366;UpperBoundValue;"<EPM-HTML>

Upper bound value for the interval defining the property value. If the value is not given, it indicates an open bound (all values to be greater than or equal to <i>LowerBoundValue</i>).

</EPM-HTML>"

367;LowerBoundValue;"<EPM-HTML>

Lower bound value for the interval defining the property value. If the value is not given, it indicates an open bound (all values to be lower than or equal to <i>UpperBoundValue</i>).

</EPM-HTML>"

368;Unit;"<EPM-HTML>

Unit for the upper and lower bound values, if not given, the default value for the measure type is used as defined by the global unit assignment at <i>IfcProject.UnitInContext</i>. The applicable unit is then selected by the underlying TYPE of the <i>UpperBoundValue</i>, <i>LowerBoundValue</i>, and <i>SetPointValue</i>)

</EPM-HTML>"

369;SetPointValue;"<EPM-HTML>

Set point value as typically used for operational value setting.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been added at the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

374;DefiningValues;"<EPM-HTML>

List of defining values, which determine the defined values. This list shall have unique values only.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

375;DefinedValues;"<EPM-HTML>

Defined values which are applicable for the scope as defined by the defining values.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

376;Expression;Expression for the derivation of defined values from the defining values, the expression is given for information only, i.e. no automatic processing can be expected from the expression.

377;DefiningUnit;Unit for the defining values, if not given, the default value for the measure type (given by the TYPE of the defining values) is used as defined by the global unit assignment at IfcProject.

378;DefinedUnit;Unit for the defined values, if not given, the default value for the measure type (given by the TYPE of the defined values) is used as defined by the global unit assignment at IfcProject.

379;CurveInterpolation;"<EPM-HTML>

Interpolation of the curve between two defining and defined values that are provided. if not provided a linear interpolation is assumed.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been added at the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

389;UsageName;Description of the use of the referenced value within the property.

390;PropertyReference;"<EPM-HTML>

Reference to another property entity through one of the select types in the <i>IfcObjectReferenceSelect</i>.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

401;ListValues;"<EPM-HTML>

List of property values.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been made optional with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

402;Unit;Unit for the list values, if not given, the default value for the measure type (given by the TYPE of nominal value) is used as defined by the global unit assignment at IfcProject.

409;Name;Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements.

410;Description;Further explanation that might be given to the quantity.

411;HasExternalReferences;"<EPM-HTML>

Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE New inverse attribute.

</font>

</small>

</blockquote>

</EPM-HTML>"

412;PartOfComplex;Reference to a physical complex quantity in which the physical quantity may be contained.

420;Unit;Optional assignment of a unit. If no unit is given, then the global unit assignment, as established at the IfcProject, applies to the quantity measures.

422;LengthValue;Length measure value of this quantity.

423;Formula;"<EPM-HTML>

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

<blockquote>

<small><font color=""ff0000"">IFC2x4 CHANGE Attribute added to the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

427;AreaValue;Area measure value of this quantity.

428;Formula;"<EPM-HTML>

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

<blockquote>

<small><font color=""ff0000"">IFC2x4 CHANGE Attribute added to the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

432;VolumeValue;Volume measure value of this quantity.

433;Formula;"<EPM-HTML>

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

<blockquote>

<small><font color=""ff0000"">IFC2x4 CHANGE Attribute added to the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

437;CountValue;Count measure value of this quantity.

438;Formula;"<EPM-HTML>

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

<blockquote>

<small><font color=""ff0000"">IFC2x4 CHANGE Attribute added to the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

441;WeightValue;Mass measure value of this quantity.

442;Formula;"<EPM-HTML>

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

<blockquote>

<small><font color=""ff0000"">IFC2x4 CHANGE Attribute added to the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

446;TimeValue;Time measure value of this quantity.

447;Formula;"<EPM-HTML>

A formula by which the quantity has been calculated. It can be assigned in addition to the actual value of the quantity. Formulas could be mathematic calculations (like width x height), database links, or a combination. The formula is for informational purposes only.

<blockquote>

<small><font color=""ff0000"">IFC2x4 CHANGE Attribute added to the end of the attribute list.

</font></small>

</blockquote>

</EPM-HTML>"

451;HasQuantities;Set of physical quantities that are grouped by this complex physical quantity according to a given discrimination.

452;Discrimination;Identification of the discrimination by which this physical complex property is distinguished. Examples of discriminations are 'layer', 'steel bar diameter', etc.

453;Quality;Additional indication of a quality of the quantities that are grouped under this physical complex quantity.

454;Usage;Additional indication of a usage type of the quantities that are grouped under this physical complex quantity.

463;ServicesBuildings;"<EPM-HTML>Reference to the <strike>building</strike> spatial structure via the objectified relationship <i>IfcRelServicesBuildings</i>, which is serviced by the system.

</EPM-HTML>"

465;LongName;"<EPM-HTML>

Long name for a zone, used for informal purposes. It should be used, if available, in conjunction with the inherited <i>Name</i> attribute.

<blockquote>

<small>NOTE In many scenarios the <i>Name</i> attribute refers to the short name or number of a zone, and the <i>LongName</i> refers to the full name.

</small>

</br>

<small>

<font color=""#ff0000"">IFC2x4 CHANGE The attribute has been added at the end of the entity definition.</font>

</small>

</blockquote>

</EPM-HTML>"

470;ConnectionGeometry;"<EPM-HTML>

The geometric shape representation of the connection geometry that is provided in the object coordinate system of the <i>RelatingElement</i> (mandatory) and in the object coordinate system of the <i>RelatedElement</i> (optionally).

</EPM-HTML>"

471;RelatingElement;"<EPM-HTML>

Reference to a subtype of <i>IfcElement</i> that is connected by the connection relationship in the role of <i>RelatingElement</i>.

</EPM-HTML>"

472;RelatedElement;"<EPM-HTML>

Reference to a subtype of <i>IfcElement</i> that is connected by the connection relationship in the role of <i>RelatedElement</i>.

</EPM-HTML>"

477;RelatingSpace;Reference to one spaces that is delimited by this boundary.

478;RelatedBuildingElement;"<EPM-HTML>

Reference to <strike>Building</strike> Element, that defines the Space Boundaries.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcBuildingElement</i> to <i>IfcElement</i> with upward compatibility for file based exchange.

</font>

</small>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been changed to be mandatory.

</font>

</small>

</blockquote>

</EPM-HTML>"

479;ConnectionGeometry;"<EPM-HTML>

Physical representation of the space boundary. Provided as a <u>curve or</u> surface given within the LCS of the space.

<blockquote><small><font color=""#ff0000"">

IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcConnectionSurfaceGeometry</i> to <i>IfcConnectionGeometry</i> with upward compatibility for file based exchange.

</font></small></blockquote>

</EPM-HTML>"

480;PhysicalOrVirtualBoundary;"Defines, whether the Space Boundary is physical (Physical) or virtual (Virtual)."

481;InternalOrExternalBoundary;"Defines, whether the Space Boundary is internal (Internal), or external, i.e. adjacent to open space (that can be an partially enclosed space, such as terrace (External)."

484;ParentBoundary;"<EPM-HTML>

Reference to the host, or parent, space boundary within which this inner boundary is defined.

</EPM-HTML>"

485;InnerBoundaries;"<EPM-HTML>

Reference to the inner boundaries of the space boundary. Inner boundaries are defined by the space boundaries of openings, doors and windows.

</EPM-HTML>"

487;ParentBoundary;"<EPM-HTML>

Reference to the host, or parent, space boundary within which this inner boundary is defined.

</EPM-HTML>"

488;CorrespondingBoundary;"<EPM-HTML>

Reference to the other space boundary of the pair of two space boundaries on either side of a space separating thermal boundary element.

</EPM-HTML>"

489;Corresponds;"<EPM-HTML>

Reference to the other space boundary of the pair of two space boundaries on either side of a space separating thermal boundary element.

</EPM-HTML>"

490;InnerBoundaries;"<EPM-HTML>

Reference to the inner boundaries of the space boundary. Inner boundaries are defined by the space boundaries of openings, doors and windows.

</EPM-HTML>"

495;PredefinedType;"<EPM-HTML>

Predefined generic types for a space that are specified in an enumeration. There might be property sets defined specifically for each predefined type.

<blockquote>

<small>

Previous use, prior to IFC2x4, had been to indicates whether the <i>IfcSpace</i> is an interior space by value INTERNAL, or an exterior space by value EXTERNAL. This use is now deprecated, the property 'IsExternal' at 'Pset_SpaceCommon' should be used instead.

</small>

</blockquote>

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been renamed from <i>ExteriorOrInteriorSpace</i> with upward compatibility for file based exchange.

</font>

</small>

</blockquote>

</EPM-HTML>"

496;ElevationWithFlooring;"Level of flooring of this space; the average shall be taken, if the space ground surface is sloping or if there are level differences within this space."

497;HasCoverings;"<EPM-HTML>

Reference to <i>IfcCovering</i> by virtue of the objectified relationship <i>IfcRelCoversSpaces</i>. It defines the concept of a space having coverings assigned. Those coverings may represent different flooring, or tiling areas.

<blockquote><small>

NOTE&nbsp; Coverings are often managed by the space, and not by the building element, which they cover.<br>

<font color=""#ff0000"">IFC2x Edition3 CHANGE&nbsp; New inverse relationship. Upward compatibility for file based exchange is guaranteed.</font>

</small></blockquote>

</EPM-HTML>"

498;BoundedBy;"<EPM-HTML>

Reference to a set of <i>IfcRelSpaceBoundary</i>'s that defines the physical or virtual delimitation of that space against physical or virtual boundaries.

</EPM-HTML>"

506;CompositionType;"<EPM-HTML>

Denotes, whether the predefined spatial structure element represents itself, or an aggregate (complex) or a part (part). The interpretation is given separately for each subtype of spatial structure element. If no <em>CompositionType</em> is asserted, the dafault value 'ELEMENT' applies.

<blockquote>

<p>

<span style=""font-size:smaller;color=red"">

IFC2x4 CHANGE&nbsp

Attribute made optional.</span>

</p>

</blockquote>

</EPM-HTML>"

507;ContainsElements;"<EPM-HTML>

Set of spatial containment relationships, that holds those elements, which are contained within this element of the project spatial structure.

<blockquote><small>

NOTE&nbsp; The spatial containment relationship, established by <i>IfcRelContainedInSpatialStructure</i>, is required to be an hierarchical relationship, i.e. each element can only be assigned to 0 or 1 spatial structure element.

</small></blockquote>

</EPM-HTML>"

513;LongName;"<EPM-HTML>

Long name for a spatial structure element, used for informal purposes. It should be used, if available, in conjunction with the inherited <i>Name</i> attribute.

<blockquote>

<small>NOTE In many scenarios the <i>Name</i> attribute refers to the short name or number of a spacial element, and the <i>LongName</i> refers to the full name.

</small>

</blockquote>

</EPM-HTML>"

514;ServicedBySystems;"<EPM-HTML>

Set of relationships to systems, that provides a certain service to the spatial element for which it is defined. The relationship is handled by the objectified relationship <i>IfcRelServicesBuildings</i>.

<blockquote>

<small>

<font color=""#ff0000"">IFC2x Edition 4 CHANGE&nbsp; The inverse attribute has been promoted to the new supertype <i>IfcSpatialElement</i> with upward compatibility for file based exchange.</font>

</small>

</blockquote>

</EPM-HTML>"

515;ReferencesElements;"<EPM-HTML>

Set of spatial reference relationships, that holds those elements, which are referenced, but not contained, within this element of the project spatial structure.

<blockquote>

<small>

NOTE&nbsp; The spatial reference relationship, established by <i>IfcRelReferencedInSpatialStructure</i>, is not required to be an hierarchical relationship, i.e. each element can be assigned to 0, 1 or many spatial structure elements.

<br><br>

EXAMPLE&nbsp; A curtain wall maybe contained in the ground floor, but maybe referenced in all floors, it reaches.

<br><br>

<font color=""#ff0000"">

IFC2x Edition 3 CHANGE&nbsp; The inverse attribute has been added with upward compatibility for file based exchange.</font>

<br><br>

<font color=""#ff0000"">

IFC2x Edition 4 CHANGE&nbsp; The inverse attribute has been promoted to the new supertype <i>IfcSpatialElement</i> with upward compatibility for file based exchange.</font>

</small>

</blockquote>

</EPM-HTML>"

525;Tag;The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level.

526;FillsVoids;"<EPM-HTML>

Reference to the <i>IfcRelFillsElement</i> Relationship that puts the element as a filling into the opening created within another element.

</EPM-HTML>

"

527;ConnectedTo;"Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to."

528;IsInterferedByElements;"<EPM-HTML>

Reference to the interference relationship to indicate the element that is interfered. The relationship, if provided, indicates that this element has an interference with one or many other elements.

<blockquote><small>

NOTE There is no indication of precedence between <i>IsInterferedByElements</i> and <i>InterferesElements</i>.

</small><br>

<small><font color=""#ff0000"">IFC2x4 CHANGE New inverse relationship.

</color></small>

</blockquote>

</EPM-HTML>"

529;InterferesElements;"<EPM-HTML>

Reference to the interference relationship to indicate the element that interferes. The relationship, if provided, indicates that this element has an interference with one or many other elements.

<blockquote><small>

NOTE There is no indication of precedence between <i>IsInterferedByElements</i> and <i>InterferesElements</i>.

</small><br>

<small><font color=""#ff0000"">IFC2x4 CHANGE New inverse relationship.

</color></small>

</blockquote>

</EPM-HTML>"

530;HasProjections;"<EPM-HTML>

Projection relationship that adds a feature (using a Boolean union) to the <I>IfcBuildingElement</I>.

</EPM-HTML>"

531;ReferencedInStructures;"<EPM-HTML>

Reference relationship to the spatial structure element, to which the element is additionally associated. This relationship may not be hierarchical, an element may be referenced by zero, one or many spatial structure elements.

<blockquote><font color=""#ff0000""><small>

IFC2x Edition 3 CHANGE&nbsp; The inverse attribute has been added with upward compatibility for file based exchange.

<small></font></blockquote>

</EPM-HTML>"

532;HasOpenings;"<EPM-HTML>

Reference to the <i>IfcRelVoidsElement</i> relationship that creates an opening in an element. An element can incorporate zero-to-many openings. For each opening, that voids the element, a new relationship <i>IfcRelVoidsElement</i> is generated.

</EPM-HTML>"

533;IsConnectionRealization;"<EPM-HTML>

Reference to the connection relationship with realizing element. The relationship, if provided, assigns this element as the realizing element to the connection, which provides the physical manifestation of the connection relationship.

</EPM-HTML>"

534;ProvidesBoundaries;"<EPM-HTML>

Reference to space boundaries by virtue of the objectified relationship <i>IfcRelSpaceBoundary</i>. It defines the concept of an element bounding spaces.

</EPM-HTML>"

535;ConnectedFrom;"Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element."

536;ContainedInStructure;"<EPM-HTML>

Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierachical, i.e. an element may only be assigned directly to zero or one spatial structure.

</EPM-HTML>"

538;HasCoverings;"<EPM-HTML>

Reference to <i>IfcCovering</i> by virtue of the objectified relationship <i>IfcRelCoversBldgElement</i>. It defines the concept of a building element having coverings associated.

</EPM-HTML>"

544;HasPorts;"<EPM-HTML>

Reference to the element to port connection relationship. The relationship then refers to the port which is contained in this element.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The inverse attribute has been demoted from <i>IfcElement</i>.

</font>

</small>

</blockquote>

</EPM-HTML>"

548;HasPorts;"<EPM-HTML>

Reference to the element type to port connection relationship. The relationship then refers to the port which is contained in this element type.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; New inverse attribute.

</font>

</small>

</blockquote>

</EPM-HTML>"

556;ElementType;"<EPM-HTML>

The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute 'PredefinedType' is set to USERDEFINED.

</EPM-HTML>"

560;ElementType;"<EPM-HTML>

The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute 'PredefinedType' is set to USERDEFINED.

</EPM-HTML>"

564;PredefinedType;"<EPM-HTML>

Predefined types to define the particular type of space. There may be property set definitions available for each predefined type.

</EPM-HTML>"

575;PredefinedType;"<EPM-HTML>

Predefined types to define the particular type of the spatial zone. There may be property set definitions available for each predefined type.

</EPM-HTML>"

591;PredefinedType;"<EPM-HTML>

Predefined types to define the particular type of the transport element. There may be property set definitions available for each predefined type.

</EPM-HTML>"

602;PredefinedType;"<EPM-HTML>

Predefined types to define the particular type of the geographic element. There may be property set definitions available for each predefined type.

</EPM-HTML>"

608;PredefinedType;"<EPM-HTML>

Predefined types to define the particular type of the transport element. There may be property set definitions available for each predefined type.

</EPM-HTML>"

623;RelatingPort;Reference to an Port that is connected by the objectified relationship.

624;RelatedElement;"<EPM-HTML>

Reference to an <i>IfcElement</i>, or <i>IfcElementType</i> that has ports assigned.

<blockquote>

<small><font color=""#ff0000"">IFC2x4 CHANGE Data type extended to <i>IfcObjectDefinition</i> to enable elements and element types for the port relationship.

</font></small>

</blockquote>

</EPM-HTML>"

627;ContainedIn;"Reference to the element to port connection relationship. The relationship then refers to the element in which this port is contained."

628;ConnectedFrom;Reference to a port that is connected by the objectified relationship.

629;ConnectedTo;Reference to the port connection relationship. The relationship then refers to the other port to which this port is connected.

631;RelatingPort;Reference to the first port that is connected by the objectified relationship.

632;RelatedPort;Reference to the second port that is connected by the objectified relationship.

633;RealizingElement;Defines the element that realizes a port connection relationship.

639;PredefinedType;"<EPM-HTML>

Predefined generic types for a transportation element that are specified in an enumeration. There might be property sets defined specifically for each predefined type.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been changed to be optional.

</font>

</small>

</blockquote>

</EPM-HTML>"

640;CapacityByWeight;Capacity of the transport element measured by weight.

641;CapacityByNumber;Capacity of the transportation element measured in numbers of person.

649;ProjectsElements;"<EPM-HTML>

Reference to the <I>IfcRelProjectsElement</I> relationship that uses this <I>IfcFeatureElementAddition</I> to create a volume addition at an element. The <I>IfcFeatureElementAddition</I> can only be used to create a single addition at a single element using Boolean addition operation.

</EPM-HTML>"

651;PredefinedType;"<EPM-HTML>

Predefined generic type for a projection element that is specified in an enumeration. There may be a property set given specificly for the predefined types.

<blockquote>

<small><font color=""#ff0000"">IFC2x4 CHANGE The attribute has been added at the end of the entity definition.</font></small>

</blockquote>

</EPM-HTML>"

656;RelatingElement;"<EPM-HTML>

Element at which a projection is created by the associated <I>IfcProjectionElement</I>.

</EPM-HTML>"

657;RelatedFeatureElement;"<EPM-HTML>

Reference to the <I>IfcFeatureElementAddition</I> that defines an addition to the volume of the element, by using a Boolean addition operation. An example is a projection at the associated element.

</EPM-HTML>"

659;RelatingElement;"<EPM-HTML>

Reference to <strike>building</strike> element in which a void is created by associated <strike>opening</strike> feature subtraction element.

<blockquote>

<p>

<span style=""font-size:smaller;color=red"">

IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <em>IfcBuildingElement</em> to <em>IfcElement</em> with upward compatibility for file based exchange.</span><br>

<span style=""font-size:smaller;color=red"">

IFC2x4 CHANGE&nbsp

Renamed to <em>RelatingElement</em>.</span>

</p>

</blockquote>

</EPM-HTML>"

660;RelatedOpening;"<EPM-HTML>

Reference to the <strike>opening</strike> feature subtraction element which defines a void in the associated <strike>opening</strike> element.

<blockquote>

<p>

<span style=""font-size:smaller;color=red"">

IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <em>IfcOpeningElement</em> to <em>IfcFeatureElementSubtraction</em> with upward compatibility for file based exchange.</span><br>

<span style=""font-size:smaller;color=red"">

IFC2x4 CHANGE&nbsp

Renamed to <em>RelatedOpening</em>.</span>

</p>

</blockquote>

</EPM-HTML>"

663;VoidsElements;"Reference to the Voids Relationship that uses this Opening Element to create a void within an Element. The Opening Element can only be used to create a single void within a single Element."

668;PredefinedType;"<EPM-HTML>

Predefined generic type for an opening that is specified in an enumeration. There may be a property set given specificly for the predefined types.

<blockquote>

<small><font color=""#ff0000"">IFC2x4 CHANGE The attribute has been added at the end of the entity definition.</font></small>

</blockquote>

</EPM-HTML>"

669;HasFillings;"Reference to the Filling Relationship that is used to assign Elements as Fillings for this Opening Element. The Opening Element can be filled with zero-to-many Elements."

677;RelatingOpeningElement;"Opening Element being filled by virtue of this relationship."

678;RelatedBuildingElement;"<EPM-HTML>

Reference to <strike>building</strike> element that occupies fully or partially the associated opening.

<blockquote><small><font color=""#ff0000"">

IFC2x PLATFORM CHANGE: The data type has been changed from <i>IfcBuildingElement</i> to <i>IfcElement</i> with upward compatibility for file based exchange.

</font><small></blockquote>

</EPM-HTML>"

680;AssemblyPlace;A designation of where the assembly is intended to take place defined by an Enum.

681;PredefinedType;"<EPM-HTML>

Predefined generic types for a element assembly that are specified in an enumeration. There might be property sets defined specifically for each predefined type.

<blockquote>

<small>

<font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been changed to be optional.

</font>

</small>

</blockquote>

</EPM-HTML>"

690;PredefinedType;"<EPM-HTML>

Predefined generic types for a geographic element that are specified in an enumeration. There might be property sets defined specifically for each predefined type.

</EPM-HTML>"

694;RelatingElement;"<EPM-HTML>

Reference to a subtype of <i>IfcElement</> that is the <i>RelatingElement</i> in the interference relationship. Depending on the value of <i>ImpliedOrder</i> the <i>RelatingElement</i> may carry the notion to be the element from which the interference geometry should be subtracted.

</EPM-HTML>"

695;RelatedElement;"<EPM-HTML>

Reference to a subtype of <i>IfcElement</> that is the <i>RelatedElement</i> in the interference relationship. Depending on the value of <i>ImpliedOrder</i> the <i>RelatedElement</i> may carry the notion to be the element from which the interference geometry should not be subtracted.

</EPM-HTML>"

696;InterferenceGeometry;"<EPM-HTML>

The geometric shape representation of the interference geometry that is provided in the object coordinate system of the <i>RelatingElement</i> (mandatory) and in the object coordinate system of the <i>RelatedElement</i> (optionally).

</EPM-HTML>"

697;InterferenceType;"<EPM-HTML>

Optional identifier that describes the nature of the interference. Examples could include 'Clash', 'ProvisionForVoid', etc.

</EPM-HTML>"

698;ImpliedOrder;"<EPM-HTML>

Logical value indicating whether the interference geometry should be subtracted from the <i>RelatingElement</i> (if TRUE), or whether it should be either subtracted from the <i>RelatingElement</i> or the <i>RelatedElement</i> (if FALSE), or whether no indication can be provided (if UNKNOWN).

</EPM-HTML>"

701;RelatedElements;"<EPM-HTML>

Set of products, which are referenced within this level of the spatial structure hierarchy.

<blockquote><small>NOTE&nbsp; Referenced elements are contained elsewhere within the spatial structure, they are referenced additionally by this spatial structure element, e.g., because they span several stories.</small>

</blockquote>

</EPM-HTML>"

702;RelatingStructure;"<EPM-HTML>

Spatial structure element, within which the element is referenced. Any element can be contained within zero, one or many elements of the project spatial and zoning structure.

<blockquote>

<small>

<font color=""#ff0000"">IFC2x Edition 4 CHANGE&nbsp; The attribute <i>relatingStructure</i> as been promoted to the new supertype <i>IfcSpatialElement</i> with upward compatibility for file based exchange.</font>

</small>

</blockquote>

</EPM-HTML>"

705;RealizingElements;Defines the elements that realize a connection relationship.

706;ConnectionType;The type of the connection given for informal purposes, it may include labels, like 'joint', 'rigid joint', 'flexible joint', etc.

708;RelatedElements;"<EPM-HTML>

Set of <strike>elements</strike> products, which are contained within this level of the spatial structure hierarchy.

<blockquote><font color=""#ff0000""><small>

IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcElement</i> to <i>IfcProduct</i> with upward compatibility

<small></font></blockquote>

</EPM-HTML>"

709;RelatingStructure;"<EPM-HTML>

Spatial structure element, within which the element is contained. Any element can only be contained within one element of the project spatial structure.

</EPM-HTML>"

712;UAxes;List of grid axes defining the first row of grid lines.

713;VAxes;List of grid axes defining the second row of grid lines.

714;WAxes;List of grid axes defining the third row of grid lines. It may be given in the case of a triangular grid.

715;ContainedInStructure;"<EPM-HTML>

Relationship to a spatial structure element, to which the grid is primarily associated.

<blockquote><small><font color=""#FF0000"">IFC2x PLATFORM CHANGE&nbsp; The inverse relationship has been added to <I>IfcGrid</I> with upward compatibility</font>

</small></blockquote>

</EPM-HTML>"

718;ContainedInStructure;Relationship to a spatial structure element, to which the associate is primarily associated.

720;PredefinedType;"<EPM-HTML>

Predefined types to define the particular type of the spatial zone. There may be property set definitions available for each predefined type.

</EPM-HTML>"

726;PredefinedType;"<EPM-HTML>

Predefined generic types for an external spatial element that are specified in an enumeration. There might be property sets defined specifically for each predefined type.

</EPM-HTML>"

727;BoundedBy;"<EPM-HTML>

Reference to a set of <i>IfcRelSpaceBoundary</i>'s that defines the physical or virtual delimitation of that external spacial element against physical or virtual boundaries.

</EPM-HTML>"

736;RelatingSystem;"System that services the Buildings. "

737;RelatedBuildings;"<EPM-HTML>

Spatial structure elements (including site, building, storeys) that are serviced by the system.

<blockquote>

<small>

<font color=""#FF0000"">IFC2x PLATFORM CHANGE&nbsp; The data type has been changed from <i>IfcBuilding</i> to <i>IfcSpatialStructureElement</i> with upward compatibility for file based exchange.</font>

<br><br>

<font color=""#FF0000"">IFC2x Edition 4 CHANGE&nbsp; The data type has been changed from <i>IfcSpatialStructureElement</i> to <i>IfcSpatialElement</i> with upward compatibility for file based exchange.

</small>

</blockquote>

</EPM-HTML>"

739;ElevationOfRefHeight;Elevation above sea level of the reference height used for all storey elevation measures, equals to height 0.0. It is usually the ground floor level.

740;ElevationOfTerrain;Elevation above the minimal terrain level around the foot print of the building, given in elevation above sea level.

741;BuildingAddress;Address given to the building for postal purposes.

743;Elevation;Elevation of the base of this storey, relative to the 0,00 internal reference height of the building. The 0.00 level is given by the absolute above sea level height by the ElevationOfRefHeight attribute given at IfcBuilding.

745;RefLatitude;"<EPM-HTML>

World Latitude at reference point (most likely defined in legal description). Defined as integer values for degrees, minutes, seconds, and, optionally, millionths of seconds with respect to the world geodetic system WGS84.

<BLOCKQUOTE> <FONT SIZE=""-1"">Latitudes are measured relative to the geodetic equator, north of the equator by positive values - from 0 till +90, south of the equator by negative values - from 0 till -90.</FONT></BLOCKQUOTE>

</EPM-HTML>"

746;RefLongitude;"<EPM-HTML>

World Longitude at reference point (most likely defined in legal description). Defined as integer values for degrees, minutes, seconds, and, optionally, millionths of seconds with respect to the world geodetic system WGS84.

<BLOCKQUOTE> <font size=""-1"">Longitudes are measured relative to the geodetic zero meridian, nominally the same as the Greenwich prime meridian: longitudes west of the zero meridian have negative values - from 0 till -180, longitudes east of the zero meridian have positive values - from 0 till -180.</font><br>

<font size=""-1"">Example: Chicago Harbor Light has according to WGS84 a longitude -87.35.40 (or 87.35.40W) and a latitude 41.53.30 (or 41.53.30N).</font>

</BLOCKQUOTE>

</EPM-HTML>"

747;RefElevation;"Datum elevation relative to sea level."

748;LandTitleNumber;The land title number (designation of the site within a regional system).

749;SiteAddress;Address given to the site for postal purposes.

766;MethodOfMeasurement;"<EPM-HTML>Name of the method of measurement used to calculate the element quantity. The method of measurement attribute has to be made recognizable by further agreements.

<BLOCKQUOTE> <FONT COLOR=""#FF0000"" SIZE=""-1"">IFC2x2 Addendum 1 change: The attribute has been changed to be optional </FONT></BLOCKQUOTE>

</EPM-HTML>"

767;Quantities;The individual quantities for the element, can be a set of length, area, volume, weight or count based quantities.

771;RelatingMaterial;"<EPM-HTML>

Material definition assigned to the elements or element types.

</EPM-HTML>"

778;ObjectPlacement;Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system.

779;Representation;Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement.

780;ReferencedBy;"<EPM-HTML>

Reference to the <i>IfcRelAssignsToProduct</i> relationship, by which other products, processes, controls, resources or actors (as subtypes of <i>IfcObjectDefinition</i>) can be related to this product.

</EPM-HTML>"

789;ObjectType;"<EPM-HTML>

The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute <i>PredefinedType</i> is set to USERDEFINED.

<br>

</EPM-HTML>"

790;IsDeclaredBy;"<EPM-HTML>

Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated <i>IfcObject</i>, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring <i>IfcObject</i>, or its subtypes.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; New inverse relationship, change made with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

791;Declares;"<EPM-HTML>

Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated <i>IfcObject</i>, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring <i>IfcObject</i>, or its subtypes.

<blockquote>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; New inverse relationship, change made with upward compatibility for file based exchange.

</font></small>

</blockquote>

</EPM-HTML>"

792;IsTypedBy;"<EPM-HTML>

Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated <i>IfcTypeObject</i>, or its subtypes, contains the specific information (or type, or style), that is common to all instances of <i>IfcObject</i>, or its subtypes, referring to the same type.

<blockquote><small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; New inverse relationship, the link to <i>IfcRelDefinesByType</i> had previously be included in the inverse relationship <i>IfcRelDefines</i>. Change made with upward compatibility for file based exchange.

</font></small></blockquote>

</EPM-HTML>"

793;IsDefinedBy;"<EPM-HTML>

Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.

<blockquote><small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The data type has been changed from <i>IfcRelDefines</i> to <i>IfcRelDefinesByProperties</i> with upward compatibility for file based exchange.

</font></small></blockquote>

</EPM-HTML>"

798;HasAssignments;Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.

799;Nests;"<EPM-HTML>

References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).

<blockquote><p><small><span style=""color:#FF0000"">

IFC2x4 CHANGE&nbsp; The inverse attribute datatype has been added and separated from <i>Decomposes</i> defined at <i>IfcObjectDefinition</i>.

</span></small></p></blockquote>

</EPM-HTML>"

800;IsNestedBy;"<EPM-HTML>

References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).

<blockquote><p><small><span style=""color:#FF0000"">

IFC2x4 CHANGE&nbsp; The inverse attribute datatype has been added and separated from <i>IsDecomposedBy</i> defined at <i>IfcObjectDefinition</i>.

</span></small></p></blockquote>

</EPM-HTML>"

801;HasContext;"<EPM-HTML>

References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.

<blockquote><p><small><span style=""color:#FF0000"">

IFC2x4 CHANGE&nbsp; The inverse attribute datatype has been added.

</span></small></p></blockquote>

</EPM-HTML>"

802;IsDecomposedBy;"<EPM-HTML>

References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).

<blockquote><p><small><span style=""color:#FF0000"">

IFC2x4 CHANGE&nbsp; The inverse attribute datatype has been changed from the supertype <i>IfcRelDecomposes</i> to subtype <i>IfcRelAggregates</i>.

</span></small></p></blockquote>

</EPM-HTML>"

803;Decomposes;"<EPM-HTML>

References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).

<blockquote><p><small><span style=""color:#FF0000"">

IFC2x4 CHANGE&nbsp; The inverse attribute datatype has been changed from the supertype <i>IfcRelDecomposes</i> to subtype <i>IfcRelAggregates</i>.

</span></small></p></blockquote>

</EPM-HTML>"

804;HasAssociations;Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.

809;GlobalId;"Assignment of a globally unique identifier within the entire software world."

810;OwnerHistory;"<EPM-HTML>

Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,

<blockquote>

<small>

NOTE only the last modification in stored - either as addition, deletion or modification.

</small><br>

<small><font color=""#ff0000"">

IFC2x4 CHANGE&nbsp; The attribute has been changed to be OPTIONAL.

</font></small></blockquote>