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‎src/pages/migration.md‎

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These changes can be disabled while compiling BT.CPP with the CMake option __USE_V3_COMPATIBLE_NAMES__.
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:::
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## XML
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You should add the attribute `BTCPP_format` to the \<root> tag of your XML:
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Before:
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```xml
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<root>
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```
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Now:
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```xml
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<root BTCPP_format="4">
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```
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This will allow us to be compatible
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with both versions 3 and 4 (in future releases, not yet).
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## SubTree and SubTreePlus
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The deafault **SubTree** in 3.X has been deprecated and

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