anchor.diff:  g.sparql("""SELECT * WHERE { }""")
   ----
   
  -[[match-constant-values]]
   ==== Match Constant Values
   
   Select all vertices with the label `person`.
  
positive.code:   ?person e:created ?project . }""")
  ----
  
  [[filtering]]
  ==== Filtering
  
  Select only those persons who are older than 30.
  
negative.code:     FILTER (?age > 30)}""")
  ----
  
  ==== Multiple Filters
  
  Select the distinct names of all Java projects.
  