I have a Query Execution Service that returns a QueryExecution that is within another triple-store, and that other triple store supports some functions my other graphs do not. Specifically, it is virtuoso, and supports bif:lower and bif:contains. My intuition is that I need to write filter functions that allow ARQ to parse these, and then pass these down to the lower level. However, maybe there is an easier way.
Can you guys please advice what is the easiest/best practice way to do this? This is not a Virtuoso list, so I will spare you the EXPLAIN output that convinces me that FILTER(CONTAINS(?something, "word")) never drives the query, but FILTER(bif:contains(?something, "word")) will drive the query if there is full text indexing. Thanks, -Dan Davis
