%common.ent; ]> SGML The SGML DocBook DTDs. The DocBook Document Type expressed in SGML. DocBook V&dbcurrent; is the current version of DocBook. Earlier versions are for legacy and historical interest, use of older versions is strongly discouraged. DocBook V4.2 DocBook V4.1 DocBook V4.0 DocBook V3.1 DocBook V3.0 DocBook V2.4.1 DocBook V2.4 DocBook V2.3 DocBook V2.2.1 DocBook V2.1 DocBook V1.2.1 DocBook V1.2 DocBook V1.1 DocBook V1.0