Norman Walsh's schemas (DTD, Relax NG, W3C schema) for Docbook 5.X
Docbook 5.X is a complete rewrite of Docbook in RELAX NG and not compatible
with previous Docbook versions. This package contains Relax NG , DTD and W3C
schema for Docbook 5.X. Syntax of those schemas is XML-compliant and is
developed by the OASIS consortium.