Php - XML Schema version

I'm searching for a while for what version xsd support php (5.3.0) has, but I haven't found anything. :S I'm trying to use xsd:assert in a s开发者_如何学编程chema with php, but I haven't managed it yet. Can anybody help me?

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PHP supports XSD through libxml2 library, which may not support this yet.

http://xmlsoft.org/