def convert_to_uri(self, value, strip_iri=True):
        ''' converts a prefixed rdf ns equivalent value to its uri form.
            If not found returns the value as is

            args:
                value: the URI/IRI to convert
                strip_iri: removes the < and > signs
                rdflib_uri: returns an rdflib URIRef
            '''
        parsed = self.parse_uri(str(value))

        try:
            new_uri = "%s%s" % (self.ns_dict[parsed[0]], parsed[1])
            if not strip_iri:
                return self.iri(new_uri)
            return new_uri
        except KeyError:
            return self.rpyhttp(value)
converts a prefixed rdf ns equivalent value to its uri form.
            If not found returns the value as is

            args:
                value: the URI/IRI to convert
                strip_iri: removes the < and > signs
                rdflib_uri: returns an rdflib URIRef