Absolute URIs on the Network

http://docbook.org/rng/4.2/docbook.rng

http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd

urn:publicid:-:OASIS:DTD+DocBook+XML+V4.2:EN

http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl