Context-aware autocompletion in SPARQL queries

[situx]

The next SPARQL unicorn release will feature autocompletion of properties in the SPARQL query dialogue.
However, this autocompletion is currently not context-aware.
It should recognize if the user should insert a subject, predicate or object and give appropriate suggestions instead of only suggesting properties.
At best autocompletion options should be loaded live from the respective triple store if appropriate.