docs: def _parse_graph(self):
  
  		'''
  		use Content-Type from headers to determine parsing method
  
  		Args:
  			None
  
  		Return:
  			None: sets self.rdf by parsing data from GET request, or setting blank graph of resource does not yet exist
  		'''
  
  		# if resource exists, parse self.rdf.data
  		if self.exists:
  			self.rdf.graph = self.repo.api.parse_rdf_payload(self.rdf.data, self.headers)
  
  		# else, create empty graph
  		else:
  			self.rdf.graph = rdflib.Graph()
  
  		# bind any additional namespaces from repo instance, but do not override
  		self.rdf.namespace_manager = rdflib.namespace.NamespaceManager(self.rdf.graph)
  		for ns_prefix, ns_uri in self.rdf.prefixes.__dict__.items():
  			self.rdf.namespace_manager.bind(ns_prefix, ns_uri, override=False)
  
  		# conversely, add namespaces from parsed graph to self.rdf.prefixes
  		for ns_prefix, ns_uri in self.rdf.graph.namespaces():
  			setattr(self.rdf.prefixes, ns_prefix, rdflib.Namespace(ns_uri))
  			setattr(self.rdf.uris, rdflib.Namespace(ns_uri), ns_prefix)
  
  		# pin old graph to resource, create copy graph for modifications
  		self.rdf._orig_graph = copy.deepcopy(self.rdf.graph)
  
  		# parse triples for object-like access
  		self.parse_object_like_triples()