docbookxsl_htmlchunked=http://docbook.sourceforge.net/release/xsl/current/xhtml/chunk.xsl
docbookxsl_htmlsingle=http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
docbookxsl_fo=http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl
docbookdtdurl=http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd