xml-model

processing instruction for associating schema with an XML document

<?xml version="1.0" encoding="utf-8"?>
<?xml-model href="http://www.docbook.org/xml/5.0/rng/docbook.rng"?>
<book xmlns="http://docbook.org/ns/docbook">
 …
</book>

supports all schema languages (including DTD, W3C XML Schema, RELAX NG, Schematron, NVDL)

the aim is to standardize proprietary instructions supported in various tools

in many cases it is still better to associate schema indirectly using e.g. NVDL, XProc or some application specific mapping table

developed jointly by W3C and SC34

W3C WG Note: http://www.w3.org/TR/xml-model/

DIS ballot in SC34 will be finished after next week