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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_label(self, urn):
 """ Provisional route for GetLabel request :param urn: URN to filter the resource :param inv: Inventory Identifier :return: GetLabel response """

        node = self.resolver.getTextualNode(textId=urn)
        r = render_template(
            "cts/GetLabel.xml",
            request_urn=str(urn),
            full_urn=node.urn,
            metadata={
                "groupname": [(literal.language, str(literal)) for literal in node.metadata.get(RDF_NAMESPACES.CTS.groupname)],
                "title": [(literal.language, str(literal)) for literal in node.metadata.get(RDF_NAMESPACES.CTS.title)],
                "description": [(literal.language, str(literal)) for literal in node.metadata.get(RDF_NAMESPACES.CTS.description)],
                "label": [(literal.language, str(literal)) for literal in node.metadata.get(RDF_NAMESPACES.CTS.label)]
            },
            citation=Markup(node.citation.export(Mimetypes.XML.CTS))
        )
        return r, 200, {"content-type": "application/xml"}