GetClassificationNode.
        Gets the classification node for a given node path.
        :param str project: Project ID or project name
        :param TreeStructureGroup structure_group: Structure group of the classification node, area or iteration.
        :param str path: Path of the classification node.
        :param int depth: Depth of children to fetch.
        :rtype: :class:`<WorkItemClassificationNode> <azure.devops.v5_0.work_item_tracking.models.WorkItemClassificationNode>`

def get_classification_node(self, project, structure_group, path=None, depth=None):
        """GetClassificationNode.
        Gets the classification node for a given node path.
        :param str project: Project ID or project name
        :param TreeStructureGroup structure_group: Structure group of the classification node, area or iteration.
        :param str path: Path of the classification node.
        :param int depth: Depth of children to fetch.
        :rtype: :class:`<WorkItemClassificationNode> <azure.devops.v5_0.work_item_tracking.models.WorkItemClassificationNode>`
        """
        route_values = {}
        if project is not None:
            route_values['project'] = self._serialize.url('project', project, 'str')
        if structure_group is not None:
            route_values['structureGroup'] = self._serialize.url('structure_group', structure_group, 'TreeStructureGroup')
        if path is not None:
            route_values['path'] = self._serialize.url('path', path, 'str')
        query_parameters = {}
        if depth is not None:
            query_parameters['$depth'] = self._serialize.query('depth', depth, 'int')
        response = self._send(http_method='GET',
                              location_id='5a172953-1b41-49d3-840a-33f79c3ce89f',
                              version='5.0',
                              route_values=route_values,
                              query_parameters=query_parameters)
        return self._deserialize('WorkItemClassificationNode', response)