code: def getQNameAttribute(self, collection, attribute):
          
          tdc = self.getAttributeQName(attribute)
          if not tdc:
              return
  
          obj = self.getSchemaItem(collection, tdc.getTargetNamespace(), tdc.getName())
          if obj: 
              return obj
  
  #        raise SchemaError, 'No schema item "%s" in collection %s' %(tdc, collection)
          return
docs: returns object instance representing QName --> (namespace,name),
             or if does not exist return None.
             attribute -- an information item attribute, with a QName value.
             collection -- collection in parent Schema instance to search.