(This file is things relate to the ARQ langauge only)

+ ARQ / language
  + Dataset control: ADD GRAPH, REMOVE GRAPH, ADD DEFAULT, MERGE ...
  + Graph management: INSERT/DELETE applied to a graph; INSERT INTO // DELETE FROM
  + Alternative: batch/interactive script language (stateful) c.f. USE db ..
  + UNSAID (done!)
  + SERVICE
  + Expressions in SELECT (aliases?  access by column?)
  + LIMIT/ORDER BY to expand to include equals terms.
    e.g. "LIMIT 5 WITH TIES"

  + DATASET
    Dataset building
    MERGE (<u1> <u2>) AS <u3>
    Look in a registry to see if one exists - or build.
    
  + member(list, index, item)
    item(list, item)
    Generative functions : include list support