Requirements on validation: (1) combine schemas, (2) divide a document into pieces and validate each piece, (3) use different schema languages, (4) validators work together

Hi Folks,

Here are a few snippets from slides by MURATA Makoto:

Requirements on validation#1

- It should be possible to combine schemas representing vocabularies
easily.

- It should be possible to divide non-monolithic documents into pieces
and then validate each piece against one of the schemas.
(divide-and-validate)

Do existing schema languages meet these requirements?

- No, you have to understand all  schemas very well and change them.

- No, you have to validate the entire document against the combination
of all schemas.

   - W3C XML Schema
   - RELAX NG

Requirements on validation#2

- It should be possible to use different schema languages for different
vocabularies.

- Validators for many schema languages should work together.

Do existing schema languages meet these requirements?

- No, you are forced to use one schema language.

- No, you have to use one validator.

   - W3C XML Schema
   - RELAX NG

More... www.asahi-net.or.jp/~eb2m-mrt/svgopen/200409SVGOpen.ppt

/Roger