[dsdl-discuss] Re: Fw: DSDL - Datatypes and Character Sets

Martin quoted Peter saying

> >*Character sets can be considered a type of datatype. They
> both define a
> > set of characters that are legal within an element or attribute.
> > Therefore, I believe there is a case for combining these 2
> areas into
> > one task.

Some (may be too quick) reactions:

1. A character repertoire certainly has to do with datatypes. XML Schema and Relax NG already allow to define a simple datatype to be restricted to a specified set of characters.

BUT:

2. For mixed content (like typical text documents) this does not work, however.

3 In general, document schema writers will probably want to let the valid character repertoires depend on element type (like <formula> or <paragraph>) and/or the xml:lang attribute for "normal" texts, and to be inheritable.
If any combination of m allowed languages and n element types with mixed content will have to be redefined explicitly as having a language specific content model, this would result in m*n element type definitions.

Diederik

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