These are DocBook specifications published by the DocBook Technical Committee.
The DocBook Schema, Committee Draft 5.0, 6 Feb 2008 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR7, 28 Sep 2007 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR6, 27 Sep 2007 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR5, 12 Jul 2007 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR4, 21 May 2007 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR3, 22 Mar 2007 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR2, 13 Mar 2007 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0CR1, 21 Dec 2006 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0b6, 2 Jun 2006 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0b5, 12 Apr 2006 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0b4, 9 Mar 2006 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0b3, 1 Feb 2006 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0b2, 12 Jan 2006 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0b1, 27 Oct 2005 (HTML, PDF, XML).
The DocBook Schema, Working Draft 5.0a1, 29 June 2005 (HTML, PDF, XML).
The DocBook Document Type, OASIS Standard 4.5, 1 Oct 2006 (HTML, PDF, XML).
The DocBook Document Type, Committee Specification 4.5CR3, 2 Jun 2006 (HTML, PDF, XML).
The DocBook Document Type, Committee Specification 4.5CR2, 14 Apr 2006 (HTML, PDF, XML).
The DocBook Document Type, Working Draft 4.5CR2, 9 Mar 2006 (HTML, PDF, XML).
The DocBook Document Type, Working Draft 4.5CR1, 29 June 2005 (HTML, PDF, XML).
The DocBook Document Type, Working Draft 4.5b1, 05 May 2005 (HTML, PDF, XML).
The DocBook Document Type, Committee Draft 4.4, 27 Jan 2005 (HTML, PDF, XML).
The DocBook Document Type, Committee Draft 4.3, 31 Mar 2004 (HTML, PDF, XML).
The DocBook Document Type, Committee Specification 4.2, 16 July 2002 (HTML, PDF, XML).
The Simplified DocBook Document Type, Working Draft V1.2CR1, 09 Mar 2006 (HTML, PDF, XML).
The Simplified DocBook Document Type, Committee Specification V1.1, 01 Apr 2005 (HTML, PDF, XML).
The Simplified DocBook Document Type, Working Draft 1.1CR2, 21 Oct 2004 (HTML, PDF, XML).
The Simplified DocBook Document Type, Working Draft 1.1CR1, 27 Jul 2004 (HTML, PDF, XML).
The Simplified DocBook Document Type, Working Draft 1.1b3, 31 Mar 2004 (HTML, PDF, XML).
The Simplified DocBook Document Type, Working Draft 1.1b2, 18 Mar 2004 (HTML, PDF, XML).
The Simplified DocBook Document Type, Working Draft 1.1b1, 21 Dec 2003 (HTML, PDF, XML).
The Simplified DocBook Document Type, Committee Specification 1.0, 19 Nov 2002 (HTML, PDF, XML).