Sparql - Applying limiting criteria to predicates

Question

I\'m fairly new to RDF / Sparql, so apologies for any incorrect terminology, and also for the fairly terrible example that follows:

Given the following RDF dataset:<

Answer 1

Here's an example using SPARQL that has been deprecated from the spec (for reasons I never understood) but remains supported in Virtuoso (which will be the case for the unforseeable future)

PREFIX e: 
PREFIX foaf:  

SELECT *
FROM 
{
   foaf:knows{2} ?target .
  ?target a e:Freemason .
}

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