def exists(self, root):
        """
        Check to see if the <xs:import/> already exists
        in the specified schema root by matching I{namesapce}.
        @param root: A schema root.
        @type root: L{Element}
        """
        for node in root.children:
            if node.name != 'import':
                continue
            ns = node.get('namespace')
            if self.ns == ns:
                return 1
        return 0
Check to see if the <xs:import/> already exists
        in the specified schema root by matching I{namesapce}.
        @param root: A schema root.
        @type root: L{Element}