AlcoveBook DTD and stylesheets is a strict subset of the DocBook DTD. The ultimate goal is to provide a series of DTDs for enterprise use, commercial proposal, whitepaper, etc. For now, this is one single SGML DTD. The stylesheets are usable with both DocBook and AlcoveBook. They include a set of extensions over Norman Walsh's modular docbook stylesheets (docbook-dsssl), and a book- like layout for articles.