Repeating attribute specifications
Peter at ursus.demon.co.uk
Thu Jun 12 20:01:01 BST 1997
In message <011290D45A8ACF119B8B00805FD471D60344E247 at RED-24-MSG.dns.microsoft.com> David Schach writes:
> I think Tim misunderstood your question. In the XML DTD, it is legal to
> have multiple AttistDecl's for a given element type (see section 3.3).
> This doesn't change the validity constraint of section 3.1. Attributes
> in tags have to be unique.
I think I have misunderstood the answers as well :-) I'd be grateful for a
very simple explanation.
I assumed that the multiple attributes was so that if (say)
<!ATTLIST FOO BAR CDATA "BAZ">
occurs in the external DTD and
<!ATTLIST FOO BAR CDATA "XYZZY">
occurs in the internal subset
then this is now legal whereas it wasn't before. But what is now the default
value of BAR? I assumed it was the later declaration ("XYZZY"). Please
disabuse me if this is wrong. [I assume that
<FOO BAR="abc" BAR="xyz">
is illegal, still. If not we have some software to rewrite.]
> > -----Original Message-----
> > From: Richard Light [SMTP:richard at light.demon.co.uk]
> > Sent: Thursday, June 12, 1997 1:19 AM
> > To: xml-dev at ic.ac.uk
> > Subject: Re: Repeating attribute specifications
> > In message <18.104.22.16870611161725.00b540ac at pop.intergate.bc.ca>, Tim
> > Bray <tbray at textuality.com> writes
> > >>Is there anything in the XML spec which corresponds to the SGML
> > >>stricture that "there can only be one attribute specification for
> > each
> > >>attribute definition", i.e. that you can't have repeated attribute
> > >>specifications within a single start-tag?
> > >
> > >No. This is legal in XML. And in SGML, with the recent TC. -T.
> > The other answer I got to this question quoted the XML Lang spec
> > (section 3.1):
> > "Validity constraint - Unique Att Spec:
> > No attribute may appear more than once in the same start-tag."
> > This seemed to deal with the issue pretty conclusively: I had just
> > failed to look under "start-tags" while thinking about attributes ;-)
> > Is this all about to change with the 30 June update?
> > Richard Light
> > SGML and Museum Information Consultancy
> > richard at light.demon.co.uk
> > 3 Midfields Walk
> > Burgess Hill
> > West Sussex RH15 8JA
> > U.K.
> > tel. (44) 1444 232067
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