libxmlplusplus-general

[libxml++] Problem with namespaces ...

[Matthias W. <m...@tt...>]

Hi list,

I have tracked down a bug I have in some code, that uses libxml++, and I 
am not sure if I found a bug in libxml++, or if I just expect the wrong 
behaviour from this library.

The problem I have with libxml++ can be shown with the following code:

 >>>>>>>>
xmlpp::Document* xml_document = new xmlpp::Document;
xmlpp::Element* root_element = xml_document->create_root_node("stream",
     "http://etherx.jabber.org/streams", "stream");
root_element->set_namespace_declaration("jabber:server");
root_element->set_attribute("version", "1.0");
root_element->set_attribute("to", "example.com");

xmlpp::Element* message_element = root_element->add_child("message");
std::cout << "The namespace IRI of the message element is: '"
     << message_element->get_namespace_uri() << "'" << std::endl;
 >>>>>>>>

The output I get from this code is:

The namespace IRI of the message element is: ''

... but what I expected to get was:

The namespace IRI of the message element is: 'jabber:server'


When I serialize the document using the write_to_stream() method of 
Document, I correctly get the message element inside the namespace 
"jabber:server". But why then does the get_namespace_uri() method for 
this element return an empty string?


Tot kijk
     Matthias

Re: [libxml++] Problem with namespaces ... BUG in libxml++

[Matthias W. <m...@tt...>]

Hi list,

Matthias Wimmer schrieb:
> I have tracked down a bug I have in some code, that uses libxml++, and =
I 
> am not sure if I found a bug in libxml++, or if I just expect the wrong=
 
> behaviour from this library.

I just had some looks at the code of libxml++ and it is definetly a bug
in libxml++.

In libxml++/nodes/node.cc in the method add_child() namespace handling
is switched off, if no namespace prefix has been given (i.e. if the
default namespace is used).
IMHO this is a bug and does not conform the the XML namespace
specification. Only attributes having no namespace prefix do not have a
namespace. Elements without a namespace prefix are not namespace-less,
but are in the default namespace.

Christophe and Murray, is there any change, that if I write a patch for
libxml++, that fixes this problem, that this would get into the official
libxml++ code? Else it seems, that it would be better for me not to use
libxml++ in my current project.


Tot kijk
    Matthias

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