1 XMLVALIDATE (
2! DOCUMENT
3 XML-expression
4? %XML-validate-according-to-clause
5 )

XML-validate-according-to-clause

1 ACCORDING TO XMLSCHEMA
2 ID XML-schema-name
2.0 URI XML-uri1
2.0 NO NAMESPACE
2.1? LOCATION XML-uri2
3? %XML-valid-element-clause

XML-valid-element-clause

1? 
1 NAMESPACE XML-uri3
1 NO NAMESPACE
2 ELEMENT XML-element-name