[cxml-devel] Possible bug in cxml-stp

[rm at tuxteam.de]

On Tue, May 22, 2012 at 12:03:40PM +0200, Raymond Wiker wrote:
> On May 22, 2012, at 12:16 , rm at tuxteam.de wrote:
> > On Tue, May 22, 2012 at 10:43:27AM +0200, Raymond Wiker wrote:
> >> I'm using cxml-stp to build XML responses for a web service that implements Microsoft's "Research" API (actually, this is just a generalised search interface). While building this, I found something that looks like a bug in cxml-stp. If this is _not_ a bug, I'd be happy for any hint about what I'm doing wrong :-)
> >> 
> >> The attachment contains a small test case which builds an XML document and serializes it. The attachment should be compiled and loaded after cxml-stp has been loaded, and the commented-out test form at the end of the file should then be evaluated. 
> >> 
> >> The test uses two implementations of cxml-stp-impl::collect-local-namespaces. With the original implementation, the "Status" and "Providers" elements get incorrect xmlns attributes. With the modified version, this is not the case.
> >> 
> > 
> > 
> > Sorry, I don't have much time to investigate your example, but I think
> > your "fixup" is wrong. Your code (add-element ...) will put the new
> > element into the namespace with namespace name "", but your "fixup" will
> > emit xml that puts the element into the _default_ namespace (which, in
> > your example will be "urn:Microsoft.Search.Registration.Response").
> > A namespace of "" is _not_ the same as no declaration.
> > 
> 
> add-element calls cxml-stp:make-element, which sets the namespace to "" if it is not supplied (or nil). Thus, setting namespace-uri to "" if no uri is supplied should not make any difference (and it does not seem to do so - I just checked by defaulting namespace-uri to nil instead of "").


Yes, that first observation seemsa to be correct. But the conclusion
isn't. Cxml-stp's assumption seems to be that an unspecified namespace
means the namespace with uri "" (wich is a valid assumption given that 
every element/attribute _has_ to be in a namespace). What you seem to
expect is that cxml-stp puts an element with unspecified namespace uri
into the same namespace as an ancessor element somewhere up the tree
whose namespace prefix is "". But the element hierarchy isn't even given
during (cxml-stp:make-element ...). 
Iff you want "Status" to be in the "urn:Microsoft.Search.Registration.Response" 
namespace, then put it there. Something like:


  (let ((namespace-uri "urn:Microsoft.Search.Registration.Response"))
    (let ((root 
           (cxml-stp:make-element "ProviderUpdate" namespace-uri)))
      (add-element root `("Status" ,namespace-uri) nil "SUCCESS")
      ......

will do.

 Cheers, RalfD