Internal subset equivalent in new schema proposals?

Joel Bender joel at
Tue Dec 1 19:36:35 GMT 1998

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

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


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