sparql.py 文件源码

def __init__(self, graph=None, bindings=None):
        self.bindings = bindings or Bindings()

        if isinstance(graph, ConjunctiveGraph):
            self._dataset = graph
            if rdflib.plugins.sparql.SPARQL_DEFAULT_GRAPH_UNION:
                self.graph = self.dataset
            else:
                self.graph = self.dataset.default_context
        else:
            self._dataset = None
            self.graph = graph

        self.prologue = None
        self.now = datetime.datetime.now()

        self.bnodes = collections.defaultdict(BNode)