Clears ALL items from document, reseting it to clean

def clear_document(self):
        """
        Clears ALL items from document, reseting it to clean
        """
        self._components.clear()
        self._sequences.clear()
        self._namespaces.clear()
        self._models.clear()
        self._modules.clear()
        self._collections.clear()
        self._annotations.clear()
        self._functional_component_store.clear()
        self._collection_store.clear()