# A query use-case using Andy Seaborn's schema, for the report generator.

@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix qucs: <http://www.hpl.hp.com/semweb/query/usecases-1.rdfs#> .
@prefix quc:  <http://www.hpl.hp.com/semweb/query/usecases#> .

[ a qucs:UseCase ;
  qucs:label "xxx" ;   #pick a value
  qucs:submissionDate "2002-06-06" ;
  qucs:emailArchiveURL <http://....> ;
  qucs:name "Extract information from RDF for report generation" ;
  qucs:description
    """
    Given an RDF database of various information, extract selected parts for
    generating (say) an HTML document from the content.  The result of the query
    is a collection of variable bindings that are passed to a report formatter.
    This approach has been used in practice for the generation of Internet protocol
    registry documents.
    """ ;
  qucs:example
   [ qucs:queryLanguage "Custom" ;
     qucs:query
      """
      ( ?Header
        ( rdf:type hdr:HeaderField &
          hdr:fieldName ?name &
          rdfs:label ?purpose &
          hdr:protocol ?p
           ( hdr:protocolName ?pname &
             hdr:specification ?ps hdr:document ?psdocument ) ) )
      """ ] ;
  qucs:example
   [ qucs:queryLanguage "Same query, encoded in N3/RDF" ;
     qucs:query
      """
      hrep:HdrProtoPattern :-
        ( [ rep:var "header" ]
          [ rep:and
            ( [ rep:uri rdf:type ] [ rep:uri hdr:HeaderField ] ),
            ( [ rep:uri hdr:fieldName ] [ rep:var "name" ] ),
            ( [ rep:uri rdfs:label ] [ rep:var "purpose" ] ),
            ( [ rep:uri hdr:protocol ] [ rep:var "p" ]
              [ rep:and
                ( [ rep:uri hdr:protocolName] [ rep:var "pname" ] ),
                ( [ rep:uri hdr:specification] [ rep:var "ps" ]
                  [ rep:uri hdr:document ] [ rep:var "psdocument" ] )
            ] )
        ] ) .
      """ ] ] .