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- From: "Richard L. Goerwitz" <richard@goon.stg.brown.edu>
- To: Richard Tobin <richard@cogsci.ed.ac.uk>
- Date: Tue, 02 Feb 1999 11:40:26 -0500
Richard Tobin wrote:
>
> Consider:
>
> <!DOCTYPE foo [
> <!ELEMENT foo ANY>
> <!ATTLIST foo a NMTOKEN "x">
> <!ATTLIST foo a NMTOKEN "*">
> ]>
> <foo/>
This is valid. Duplicate ATTLIST decls are okay. If a particular attribute
such as "a"
is declared more than once, the first declaration holds. Note that <foo/>
elicits a warning
from some validators, because it uses the special empty-tag syntax, without
having been ex-
plicitly declared EMPTY (one of those "for interoperability" constraints).
If you have questions about such things, often you can just run some sample
text through
our (STG's) validator, http://www.stg.brown.edu/service/xmlvalid/. Its
output is pretty
much self-explanatory.
Here's what it says when I paste in the above document instance:
================================================================================================
Validation Results for [user-supplied text]
A list of warning messages follows:
line 4, [user-supplied text]:
warning (652): element has more than one attlist declaration: foo
line 4, [user-supplied text]:
warning (581): discarding duplicate attribute definition: a
line 6, [user-supplied text]:
warning (1106): empty-tag syntax used for element not declared with
EMPTY content model: foo
================================================================================================
Document validates OK.
================================================================================================
--
Richard Goerwitz
PGP key fingerprint: C1 3E F4 23 7C 33 51 8D 3B 88 53 57 56 0D 38 A0
For more info (mail, phone, fax no.): finger richard@goon.stg.brown.edu
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