lxml with schema 1.1

I'm trying to use lxml with the xs:assert validation tag. I've tried using the example from this IBM page: http://www.ibm.com/developerworks/library/x-xml11pt2/

<xs:elemen开发者_StackOverflow社区t name="dimension">
  <xs:complexType>
    <xs:attribute name="height" type="xs:int"/>
    <xs:attribute name="width" type="xs:int"/>
    <xs:assert test="@height < @width"/>
  </xs:complexType>
</xs:element>

It seems like lxml doesn't support XML Schema 1.1.

Can someone validate this? What XML (for Python) engine does support Schema 1.1?

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The two schema processors that currently support XSD 1.1 are Xerces and Saxon - both Java based.

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Yea, libxml does not support xsd 1.1. Use xmlschema >=1.0.14 instead.