xml-dev - Re: Internal subset equivalent in new schema proposals?

[Joel Bender <joel@spooky.emcs.cornell.edu>]

Ketil Z Malde wrote:

>  What could be useful and relatively simple, is a restriction
>  of the *form* of the data, e.g. forcing the <name type="city">
>  to contain only letters and start with a capital, or LC
>  subjects to be two upper case letters (if that's what they are).
>  Phone numbers, dates, sort keys, there are many cases where it
>  would be helpful to have the parser catch these things, I think.

I was thinking along similar lines.  I've been adding something like this
to my XML documents:

	<prop name="state" xml:regexp="[A-Z]+">NY</prop>

So the parser can verify that the CDATA matches the regular expression.
Works OK for content, but I don't see how I can add this meta-meta-data for
attributes.  That is to say, how can I tell the parser that the 'name'
attribute value for the 'prop' entity must be of the form
"[a-zA-Z_][0-9a-zA-Z_]*"?

Of course this also brings up the murky waters of grep syntax, which I've
been avoiding.


Joel

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