def evalLoad(ctx, u):

    if u.graphiri:
        ctx.load(u.iri, default=False, publicID=u.graphiri)
    else:
        ctx.load(u.iri, default=True)
http://www.w3.org/TR/sparql11-update/#load
dataset/ETHPy150Open RDFLib/rdflib/rdflib/plugins/sparql/update.py/evalLoad