def reconciliateNs(self, tree):
        """This function checks that all the namespaces declared
          within the given tree are properly declared. This is needed
          for example after Copy or Cut and then paste operations.
          The subtree may still hold pointers to namespace
          declarations outside the subtree or invalid/masked. As much
          as possible the function try to reuse the existing
          namespaces found in the new environment. If not possible
          the new namespaces are redeclared on @tree at the top of
           the given subtree. """
        if tree is None: tree__o = None
        else: tree__o = tree._o
        ret = libxml2mod.xmlReconciliateNs(self._o, tree__o)
        return ret
This function checks that all the namespaces declared
          within the given tree are properly declared. This is needed
          for example after Copy or Cut and then paste operations.
          The subtree may still hold pointers to namespace
          declarations outside the subtree or invalid/masked. As much
          as possible the function try to reuse the existing
          namespaces found in the new environment. If not possible
          the new namespaces are redeclared on @tree at the top of
           the given subtree.