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Steve Harris writes:
> I'm working out a small DTD by inlining it with some sample data. It
> uses a single internal parameter entity and refers to the entity twice
> in the DTD. Emacs's 'psgml' seems to validate and do all the
> substitutions as expected. If I run the file through expat, though, it
> reports the following error:
> illegal parameter entity reference
You've run up against a somewhat obscure constraint from section 2.8
of the XML 1.0 Recommendation:
Well-Formedness Constraint: PEs in Internal Subset
In the internal DTD subset, parameter-entity references can occur
only where markup declarations can occur, not within markup
declarations. (This does not apply to references that occur in
external parameter entities or to the external subset.)
Source: http://www.w3.org/TR/1998/REC-xml-19980210#sec-prolog-dtd
As a result, the following is legal in an _external_ DTD subset, but
not in an internal one:
<!ENTITY % my-atts "id ID #REQUIRED
role CDATA #IMPLIED">
<!ELEMENT foo (#PCDATA)>
<!ATTLIST foo
%my-atts;>
PSGML doesn't catch this one yet.
All the best,
David
--
David Megginson david@m...
http://www.megginson.com/
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