Bad relative URI resolution in SPARQL

[pchampin]

When using an explicit base URI in SPARQL queries, relative URIs are not correctly resolved.
Instead, the relative URI is simply appended at the end of the base URI.

Example:

import rdflib

g = rdflib.Graph()
r = g.query("SELECT (<../baz> as ?test) WHERE {}",
            base=rdflib.URIRef("http://example.org/foo/bar"))
print r.serialize(format="csv")

# expected result:
#test
#http://example.org/baz

# actual result;
#test
#http://example.org/foo/bar../baz

[joernhees]

yupp, seems like a bug: http://www.w3.org/TR/sparql11-query/#relIRIs