Hello, I'm experiencing a problem executing an exclusive XML canonicalization. The canonicalization declares the same namespace for two times at two elements in parent-child relation. Consider the following example:
1 <SOAP-ENV:Body 2 xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"; 3 <ns0:Ping 4 xmlns:ns0="http://xmlsoap.org/Ping"; 5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 6 xsi:type="ns0:ping"> 7 <ns0:text 8 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 9 xsi:type="xsd:string">Hello.</ns0:text> 10 </ns0:Ping> 11 </SOAP-ENV:Body>
Here, at line 8, the `xsi' namespace is re-declared even it is already declared at line 5.
Looking in sources I found a strange thing in libxml2 sources, c14n.c, line 404 (in version 2.6.8, and in the snapshot ftp://xmlsoft.org/cvs-snapshot.tar.gz too (unfortunately, the CVS server seems to be down so I was unable to consult the current source)).
The problem is in xmlExcC14NVisibleNsStackFind() function. There is a return statement in the function:
return (xmlC14NIsVisible(ctx, ns1, cur->nodeTab[i]));
The "xmlC14NIsVisible" is a macro defined at line 115+:
#define xmlC14NIsVisible( ctx, node, parent ) \
(((ctx)->is_visible_callback != NULL) ? \
(ctx)->is_visible_callback((ctx)->user_data, \
(xmlNodePtr)(node), (xmlNodePtr)(parent)) : 1)Maybe I'm missing something, but still: why the `ns1' and `cur->nodeTab[i]' (which are of types xmlNsPtr) get cast to xmlNodePtr and get passed as parameters to `is_visible_callback'?! I guess xmlSecNodeSetContains() (the callback target in case the c14n is called from xmlSec) does not expect pointers to namespaces :-).
It seems this is the root of my problem - the xmlExcC14NVisibleNsStackFind() function returns 0 (meaning
the `xsi' namespace is not already declared), so the namespace
gets declared again.
thanks in advance for any comments Tomas
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