DocBook XSL stylesheets
written in XSLT 1.0 to work with DocBook V3.x, V4.x and V5.x
very mature and widely deployed toolchain
easy to customize
XSLT 2.0 based reimplementation
currently under a development
will support all DocBook V5.0 features
pure XSLT 2.0 code, no need for external extensions
still experimental code, not as many features and parameters as XSLT 1.0 based stylesheets
required software
any XSLT processor, Saxon is the most commonly used
for PDF output we need FO engine—FOP, XEP, XSL Formatter, …