The package is unlikely to see any upstream activities, but it is often used
in Debian for documentation and one of the core packages in the XML/SGML core of Debian. Still it probably requires only little attention.
Bug #763598 can probably be fixed via rewriting xml-core.
The package description is: standard XML documentation system for software and systems
DocBook is an XML document type definition (DTD). That is, it
contains the "DocBook" document structure. This is used by authors
or editors writing documents in the DocBook XML format. DocBook was
designed for books, articles, or reference documentation about
technical matters or software. It has emerged as an open, standard
DTD in the software industry, and is the documentation system of
choice for many free software projects.
This package contains the XML DTD for DocBook, which describes the
formal structure for documents following this format. If you wish to
author DocBook documents using SGML rather than XML, use the
'docbook' package. You will need other packages in order to edit
(psgml), validate (opensp, libxml2-utils) or format (docbook-xsl,
docbook-dsssl) DocBook documents.
This package ships with the latest DocBook 4.5 XML DTD, as well as a
selected set of legacy DTDs for use with older documents, including
4.0, 4.1.2, 4.2, 4.3 and 4.4.