Conclusions

The DocBook RELAX NG schema satisfies the redesign goals to a large extent: it looks and feels like DocBook while at the same time having simpler, more logical content models and better contraints.

The RELAX NG grammar is demonstrably easier to customize, at least for those applications that can use the RELAX NG grammar directly.

DocBook NG has only 356 elements and 1,701 patterns.