DTD Question - PCDATA followed by an optional element
kragen at pobox.com
Wed Nov 17 23:16:32 GMT 1999
Norman Samuelson asks:
>To include the comment, I would like to be able to simply say:
> <!ELEMENT comment (#PCDATA)>
> <!ELEMENT rho0 (#PCDATA, comment?)>
>That doesn't seem to be acceptable. I also tried:
> <!ELEMENT rho0 ((#PCDATA) | (#PCDATA, comment))>
>Is it possible to do what I want?
No. Section 3.2.2 of REC-xml:
An element type has mixed content when elements of that type
may contain character data, optionally interspersed with child
elements. In this case, the types of the child elements may be
constrained, but not their order or their number of
The best you can do is (#PCDATA|comment)*.
<kragen at pobox.com> Kragen Sitaker <http://www.pobox.com/~kragen/>
The Internet stock bubble didn't burst on 1999-11-08. Hurrah!
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