[ expat-Bugs-918730 ] namespace uri's arent checked for an ending hash

Bugs item #918730, was opened at 2004-03-18 08:20
Message generated for change (Comment added) made by fdrake
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Category: None
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Jasper (jaspervdg)
Assigned to: Nobody/Anonymous (nobody)
Summary: namespace uri's arent checked for an ending hash

Initial Comment:
With a document like this (made much shorter):
<rdf:RDF xmlns:rdf =
"http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:dc  = "http://purl.org/dc/elements/1.1/"
         xmlns:mm  = "http://musicbrainz.org/mm/mm-2.1#">
  <mm:Artist
rdf:about="http://musicbrainz.org/artist/88a6037e-87ba-492a-a54c-c927aa620cb8">
    <dc:title>Earth Crisis</dc:title>
  </mm:Artist>
</rdf:RDF>
The element types are resolved as follows (namespace
separator is set to a hash):
  rdf:RDF ->
http://www.w3.org/1999/02/22-rdf-syntax-ns##RDF
  mm:Artist -> http://musicbrainz.org/mm/mm-2.1##Artist
  dc:title -> http://purl.org/dc/elements/1.1/#title
As far as I know that's not how it should be (having
two hashes as separator in the first two cases). For my
purpose I fixed it by modifying addBinding (in
xmlparse.c) to check whether the namespace URI already
ends in a hash.
I am using version 1.95.7.


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>Comment By: Fred L. Drake, Jr. (fdrake)
Date: 2004-04-30 02:06

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This is related to RDFs weird combining of namespace URIs
and element/attribute names; Expat is doing the right thing,
but it's up to the application to remove the separator
character before making use of the combined URI+localName.

I'm not aware of any non-RDF applications that use the
concatenated form of URI+localName.

I'm closing this as invalid; it's not Expat's job to cater
to mixed up specifications like what RDF requires in this arena.

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Comment By: Karl Waclawek (kwaclaw)
Date: 2004-03-18 09:17

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AFAIK, Expat does not check URIs for conformance at all.
Maybe it should, but this is not implemented. In the case
above I think the XML Namespaces spec allows hash marks,
as they are legal in an URI reference.

So, if you pick a namespace separator that can occur in your
URIs then this is your problem, as the above looks like Expat 
works as designed. 

I suggest you try a character as namespace separator that
is not a legal XML character. That should always work.

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