Wrapper package for DocBook 4 and 5 stylesheets.

The version 5.0 release is a complete rewrite of DocBook in RELAX NG.
The intent of this rewrite is to produce a schema that is true to the
spirit of DocBook while simultaneously removing inconsistencies that
have arisen as a natural consequence of DocBook's long, slow evolution.

xmlformat is a configurable formatter (or "pretty-printer") for XML
documents. It provides control over indentation, line-breaking, and text
wrapping. These properties can be defined on a per-element basis.

xmlformat provides improved diagnostic information when a document is not
well-formed. (Prints line and token number, and stack trace).