bug: defaultNamespace detection fails on XML-attributes when deserializing

[Jan Kowalleck]

and this one was completely unable to detect the defaultNS, and assumed it was '' -- which is the identifier for the defaultNS not the defaultNS itself ...
and then the NameSpace-detection on XML-attributes fails ...

see CycloneDX/cyclonedx-python-lib#438 (comment)

[Jan Kowalleck]

working patch:

serializable/serializable/__init__.py

Lines 455 to 462 in 9bc4abc

 if default_namespace is None: 
     _namespaces = dict([node for _, node in 
                         SafeElementTree.iterparse(StringIO(SafeElementTree.tostring(data, 'unicode')), 
                                                   events=['start-ns'])]) 
     if 'ns0' in _namespaces: 
         default_namespace = _namespaces['ns0'] 
     else: 
         default_namespace = '' 

      if default_namespace is None:
          _namespaces = dict([node for _, node in
                              SafeElementTree.iterparse(StringIO(SafeElementTree.tostring(data, 'unicode')),
                                                        events=['start-ns'])])
-         if 'ns0' in _namespaces:
-             default_namespace = _namespaces['ns0']
-         else:
-             default_namespace = ''
+         default_namespace = (re.compile(r'^\{(.+?)\}.').search(data.tag) or (None,_namespaces.get('')))[1]