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: 
  ....
  +
  ....
  SELECT *
  WHERE {?s ?p ?o}
  
negative.code: +
  We assume all subjects of statements are things. We search invalid
  statement using a query described in Listing
  <<non_http_uri_subject>>, and if nothing is found the endpoint
  satisfied this rule.
  +
  Note that we ignore Virtuoso specific graphs since Virtuoso contains a
  graph which contains invalid statements.
  +
  [[non_http_uri_subject]]
  .A Query for searching non-HTTP-URI subjects
  ....
  SELECT
    *
  