anchor.diff:  standards (RDF*, SPARQL)
   +
   We assess this rule by obtaining a subject (URI) using a query described
  -in Listing [list:query_for_a_subject] and accessing the URI via HTTP
  +in Listing <<query_for_a_subject>> and accessing the URI via HTTP
   protocol. We assume that the endpoint is satisfied with the rule if the
   URI returns any data.
   +
   Note that we ignore Virtuoso specific graphs since Virtuoso contains a
   graph which contains invalid statements.
   +
  +[[query_for_a_subject]]
  +.A Query for a Subject
   ....
   SELECT
     ?s
  
positive.code: ....
  +
  Note that $COUNT represents the number of total statements retrieved by
  Listing [list:query_for_number_of_statements].
  +
  Note that Virtuoso has trouble to count the number of statements. So
  this adhoc procedure does not work well for the endpoint based on
  
negative.code: \end{array}]
  =====================================================================
  
  We rank the endpoint as shown in Table <<umaka_rank>>
  
  [[umaka_rank]]
  .Umaka Rank
  [cols="^,^",options="header",]
  |=======================
  