RELAX NG vs DTD: Sad Statistics

(Probably, the discussion I proposed in this post seems too scholastic, but it is still close related to DocBook tools and, as I hope, will be able to discover some serious problems.)

1. DocBook XML V5.0 was released two and a half years ago.

"Schemas for DocBook 5.0 are available in several formats, but only RELAX NG schema is normative and thus preferred. Other schemas are not fully RELAX NG compatible and provided as a convenience for using with legacy tools." [Norman Walsh, DocBook 5: The Definitive Guide]

2.  DocBook XSLT Stylesheets 1.77.0 was released two weeks ago.

Download statistics (http://sourceforge.net/projects/docbook/files/):

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docbook-xsl-ns (RELAX NG) -  30 696 downloads (8.5%)

docbook-xsl (DTD)               - 329 401 downloads (91.5%)

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Total:                                  - 360 097 downloads (100%)

Only 8.5% of users have transited to RELAX NG, the rest are still stuck to "old-fashioned" DTD. Not too brilliant result for 2.5 years, is it?

Why? What prevents transition to the new functionality of DocBook 5? Any idea?

-- 
Regards,
Ivan Zaporozhets

Divine Dandelion℠ Online Publishing Service

http://divinedandelion.blogspot.com/