Top Answers

1. The mechanism of "FILTER NOT EXISTS" in SPARQL
   6 votes
2. Why doesn't the W3C RDF validator replace the URI using the full namespace?
   5 votes
3. How to traverse RDF tree in SPARQL and find connections outside of the tree?
   5 votes
4. select all triples, indicating named graph if relevant
   4 votes
5. How to maintain order while retrieving the data in sparql
   3 votes