Re: comments and PIs in XML Schema

<gkholman@cranesoftwrights.com> wrote on 04/25/2009 01:42:25 PM:

> At 2009-04-25 13:34 -0400, Michael Glavassevich wrote:
> ><gkholman@cranesoftwrights.com> wrote on 04/25/2009 01:04:13 AM:
> > > You won't see constraints on comments and PIs in DTD,
> >
> >Not quite true. Elements declared to be EMPTY [1] in a DTD are
> >forbidden from containing comments, PIs and entity references (even
> >ones whose expansion is an empty string).
>
> Granted, but those are constraints on the element.  One cannot
> declare in a model constraints on comments and PIs themselves
> regarding their cardinality and location, which is what I thought
> Mukul was looking for.

Right. I thought you were making a more general statement about whether PIs
or comments participated at all in DTD validation. Thanks for clarifying.

> I did try to be careful by saying they had places where they were
> allowed to go:
>
> At 2009-04-25 01:04 -0400, I wrote:
> >Annotations can be placed anywhere they are allowed in an XML
> >document without violating the constraints on an XML vocabulary.
>
> But I do appreciate that you brought this to light for the readers of
> the archive as my wording wasn't very detailed.  Thanks, Michael.
>
> . . . . . . . . . . Ken
>
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Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org