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<!DOCTYPE books [

<!ELEMENT books (book+)>

<!ELEMENT book (title, author+, publisher)>

<!ELEMENT title (#PCDATA)>

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<!ATTLIST book isbn CDATA #REQUIRED>

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<books>

<book isbn="0201548550" pubyear="1992">

<title>Advanced C++</title>

<author>James Coplien</author>

<publisher>Addison Wesley</publisher>

</book>

<book isbn="9781430210450" pubyear="2008">

<title>Beginning Groovy and Grails</title>

<author>Christopher M. Judd</author>

<author>Joseph Faisal Nusairat</author>

<author>James Shingler</author>

<publisher>Appress</publisher>

</book>

<book isbn="0201310058" pubyear="2001">

<title>Effective Java</title>

<author>Joshua Bloch</author>

<publisher>Addison Wesley</publisher>

</book>

</books>