anchor.diff:  4.  Properties
   +
   We retrieve a list of properties using a query described in Listing
  -<<query_for_properties_on_a_graph>>.
  +<<query_for_properties_on_a_graph, 9>>.
   +
   [[query_for_properties_on_a_graph]]
  -.Obtain the properties on a graph g
  +.Listing 9. Obtain the properties on a graph g
   ....
   SELECT DISTINCT ?p
           FROM <g>
  
positive.code: ....
  +
  [[query_for_see_also]]
  .A Query for a See Also Statement
  ....
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  SELECT
  
negative.code: 3.  Datatypes
  +
  We retrieve a list of datatypes using a query described in Listing
  <<query_for_datatypes_on_a_graph, 8>>.
  +
  [[query_for_datatypes_on_a_graph]]
  .Listing 8. Obtain the datatypes on a graph g
  ....
  SELECT DISTINCT (datatype(?o) AS ?ldt)
  FROM <g>
  