def __init__(self, sparqlnode, triples, parent1=None, parent2=None):
        self.top = sparqlnode
        self.triples = triples
        # if this node is the result of a sum...
        self.parent1 = parent1
        self.parent2 = parent2

        self.get_recursive_results = None
:param sparqlnode: top of the expansion tree, a _SPARQLNode
dataset/ETHPy150Open RDFLib/rdfextras/rdfextras/sparql/query.py/Query.__init__