Hi, I'm using lxml to verify an XML against an XRD schema, but I'm using some of the features of v1.1 which gave me an error during validation with lxml: xrd snipped: <xs:element minOccurs ="0" maxOccurs="unbounded" name="parameter"> <xs:alternative type="parameterTypeVoid" test="@type = 'void'"/> <xs:alternative type="parameterTypeVarArgs" test="@type = ''"/> <xs:alternative type="parameterTypeNormal" /> <xs:unique name="UniqueAliasName"> <xs:selector xpath="alias" /> <xs:field xpath="@name" /> </xs:unique> </xs:element> error generated by lxml: xmlschema = etree.XMLSchema(xmlschema_doc) File "src\lxml\xmlschema.pxi", line 88, in lxml.etree.XMLSchema.__init__ lxml.etree.XMLSchemaParseError: Element '{http://www.w3.org/2001/XMLSchema}element': The content is not valid. Expected is (annotation?, ((simpleType | complexType)?, (unique | key | keyref)*))., line 107 Line 107 is the part where a new feature is being used (test="...") Is this a normal behavior of lxml? Are there plans to support v1.1 [ https://www.w3.org/TR/xmlschema11-1/#intro1.1 | https://www.w3.org/TR/xmlschema11-1/#intro1.1 ] BR, Jeroen