anchor.diff:  
   1. Gremlinator currently only supports SPARQL 1.0 specification
   2. SPARQL queries with variables in the predicate position are not currently covered, with an exception of the following case:
  +[source,SPARQL]
   ----
   SELECT * WHERE { ?x ?y ?z .}
   ----
  
positive.code: 
  
   Optional Queries
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  coming soon
  
  
  
  Query modifier - Order By
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  .Select all vertices with the label `person` and order them by their age.
  [source,SPARQL]
  ----
  SELECT * WHERE {
  
negative.code: 
  
   SPARQL queries with Group By + Count
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  .example coming soon.
  [source,SPARQL]
  
  
  
  SPARQL mixed/complex/aggregation-based queries 
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  .example coming soon.
  [source,SPARQL]
  
  
  SPARQL Star-shaped queries 
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  .example coming soon.
  [source,SPARQL]
  
  
  Limitations
  