def update(self, node):
        """
        Update the specified I{node} by replacing the I{multiref} references
        with the contents of the referenced nodes and remove the I{href}
        attribute.
        @param node: A node to update.
        @type node: L{Element}
        @return: The updated node
        @rtype: L{Element}
        """
        self.replace_references(node)
        for c in node.children:
            self.update(c)
        return node
Update the specified I{node} by replacing the I{multiref} references
        with the contents of the referenced nodes and remove the I{href}
        attribute.
        @param node: A node to update.
        @type node: L{Element}
        @return: The updated node
        @rtype: L{Element}