RDF is a recommended standard for describing knowledge about resources over the Web. If we talk about querying RDF, we must consider important aspects concerning Web querying: distributed information and context oriented description of resources. In this paper we propose a framework that provides better, more complete answering to RDF queries than classical answering mechanisms. This framework provides a way to combine several RDF documents in order to compute a more complete answer to a given query. The combination of RDF documents is performed under some conditions, leading to a safe combination.