Define auto-suggest fields for query DSL

[fils]

@ashepherd

the following

prefix schema: <http://schema.org/>
SELECT DISTINCT ?val ?desc
WHERE
{
  ?res a schema:PropertyValue .
  ?res schema:value ?val   .
  ?res schema:description ?desc     
} 

results in 261 returns... Need to add a bit in there to see which provider that comes from.

Something like this might be a nice set of data to use with the autocomplete aspect of the UI.