Get handle for model resource at given Url.

        Parameters
        ----------
        resource_url : string
            Url for subject resource at SCO-API

        Returns
        -------
        models.ModelHandle
            Handle for local copy of subject resource

def models_get(self, resource_url):
        """Get handle for model resource at given Url.

        Parameters
        ----------
        resource_url : string
            Url for subject resource at SCO-API

        Returns
        -------
        models.ModelHandle
            Handle for local copy of subject resource
        """
        # Get resource directory, Json representation, active flag, and cache id
        obj_dir, obj_json, is_active, cache_id = self.get_object(resource_url)
        # Create model handle.
        model = ModelHandle(obj_json)
        # Add resource to cache if not exists
        if not cache_id in self.cache:
            self.cache_add(resource_url, cache_id)
        # Return subject handle
        return model