DTD vs Relax NG vs W3C Schema
DTDs are not XML, and need specialist software
W3C schema is not consistently implemented, is poorly documented, and looks over-complex
Relax NG on the other hand...
uncluttered design
good documentation
multiple open source 100%-complete implementations
ISO standard
useful features for multipurpose structural validation
Compelling leadership (can James Clark do wrong?)
No contest…
One Document Does it all
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