According to the schema standard xs:language type is defined as follows (see http://www.w3.org/TR/xmlschema11-2/#language):
<xs:simpleType id="language" name="language <http://www.filigris.com/products/docflex_xml/xsddoc/examples/html/xslt20/schemas/XMLSchema_xsd/simpleTypes/language.html>"> <xs:restriction base="xs:token <http://www.filigris.com/products/docflex_xml/xsddoc/examples/html/xslt20/schemas/XMLSchema_xsd/simpleTypes/token.html>"> <xs:pattern id="language.pattern" value="[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*"/> </xs:restriction> </xs:simpleType> According to that definition if we put 'aa-bb-cc' as a value of xml:lang or any custom attribute of type xs:language it should be accepted as valid one. However when using libxslt that is not the case. Definition of language type in libxslt permits only one section with - (like aa-bb, dd-cc, en-US etc.). It is as if it uses this regex for validation: [a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8}) Here are the sample files that demonstrate the issue: --- test.xml --- <?xml version="1.0" encoding="UTF-8" ?> - <rootelxmlns="*http://dummy.libxml2.validator*"; xmlns:xsi="*http://www.w3.org/2001/XMLSchema-instance*"; xsi:schemaLocation="*http://dummy.libxml2.validator test.xsd*"> <samplelanguage="*aa-bb-cc*">custom language</sample> <samplelanguage="*en-US*"xml:lang="*aa-bb-cc*">English US</sample> </rootel> --- test.xsd -- <?xml version="1.0"?> <xs:schema id="rootel" targetNamespace="http://dummy.libxml2.validator"; xmlns="http://dummy.libxml2.validator"; xmlns:xs="http://www.w3.org/2001/XMLSchema"; attributeFormDefault="qualified" elementFormDefault="qualified"> <xs:import namespace="http://www.w3.org/XML/1998/namespace"; schemaLocation="http://www.w3.org/2001/xml.xsd"; /> <xs:element name="rootel"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="sample" nillable="true"> <xs:complexType> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="language" form="unqualified" type="xs:language" /> <xs:attribute ref="xml:lang" use="optional"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema> Save these files in the same directory and execute following command to demonstrate the issue: xmllint --noout --schema test.xsd test.xml Any thoughts? This looks like a bug to me. -- Darko Miletic
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