Jing is a RELAX NG validator written in Java. It implements the RELAX NG 1.0 Specification, RELAX NG Compact Syntax, and parts of RELAX NG DTD Compatibility, specifically checking of ID/IDREF/IDREFS. It also has experimental support for schema languages other than RELAX NG; specifically W3C XML Schema, Schematron 1.5, and Namespace Routing Language.
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