AndyS questions

AndyS answers

• Multiple aggregates in SPARQL
• Jena/Arq: Query Processing get stuck
• Apache Jena: riot does not produce output
• create a new ontology with Jena
• use FILTER on graph in SPARQL query
• GROUP BY in SPARQL?
• Are property path depths actually usable in jena sparql?
• What does SELECT FROM DEFAULT actually do?
• How to extract a substring using a regular expression?
• How to know if an RDF graph is lean?