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librasqal(3)


NAME

   librasqal - Rasqal RDF query library

SYNOPSIS

   #include <rasqal.h>

   rasqal_world*world=rasqal_new_world();
   rasqal_query_results *results;
   raptor_uri *base_uri=raptor_new_uri("http://example.org/foo");
   rasqal_query *rq=rasqal_new_query(world,"rdql",NULL);
   const char *query_string="select * from <http://example.org/data.rdf>";

   rasqal_query_prepare(rq,query_string,base_uri);
   results=rasqal_query_execute(rq);
   while(!rasqal_query_results_finished(results)) {
    for(i=0;i<rasqal_query_results_get_bindings_count(results);i++) {
     const char *name=rasqal_query_results_get_binding_name(results,i);
     rasqal_literal *value=rasqal_query_results_get_binding_value(results,i);
     /* ... */
    }
    rasqal_query_results_next(results);
   }
   rasqal_free_query_results(results);
   rasqal_free_query(rq);
   raptor_free_uri(base_uri);
   rasqal_free_world(world);

   cc prog.c -o prog `pkg-config rasqal --cflags` `pkg-config rasqal --libs`

DESCRIPTION

   The  Rasqal  library  provides  a  high-level  interface  to  RDF query
   parsing, query construction, query execution  over  an  RDF  graph  and
   query  results  manipulation and formatting.  The library provides APIs
   to each of the steps in the process and provides support  for  handling
   multiple  query  language syntaxes.  At present Rasqal supports most of
   the W3C SPARQL 1.0 Query language, some of SPARQL 1.1 draft  and  fully
   supports RDQL.

   Rasqal  uses  the  libraptor(3) library for providing URI handling, WWW
   content retrieval and other support functions.

API REFERENCE

   See  the  HTML  API  docs  that  may  be  installed  system   wide   at
   /usr/share/gtk-doc/html/rasqal/      or      on      the     web     at
   http://librdf.org/rasqal/docs/api/ http://librdf.org/rasqal/docs/api/

API CHANGES

   See     the     Raptor     API     docs     changes     section      at
   http://librdf.org/rasqal/docs/api/rasqal-changes.html
   http://librdf.org/rasqal/docs/api/rasqal-changes.html

CONFORMING TO

   SPARQL Query Language for RDF, Eric  Prud'hommeaux  and  Andy  Seaborne
   (eds),       W3C       Recommendation,       15       January      2008
   http://www.w3.org/TR/2008/REC-rdf-sparql-query-20080115/
   http://www.w3.org/TR/2008/REC-rdf-sparql-query-20080115/

   SPARQL Query Results XML Format, Jeen Broekstra and Dave Beckett (eds),
   W3C Recommendation, 15  January  2008.   http://www.w3.org/TR/2008/REC-
   rdf-sparql-XMLres-20080115/  http://www.w3.org/TR/2008/REC-rdf-sparql-
   XMLres-20080115/

   RDQL - A Query Language for RDF, Andy Seaborne, W3C Member Submission 9
   January    2004   http://www.w3.org/Submission/2004/SUBM-RDQL-20040109/
   http://www.w3.org/Submission/2004/SUBM-RDQL-20040109/

SEE ALSO

   roqet(1),libraptor(3)

AUTHOR

   Dave          Beckett           -           http://purl.org/net/dajobe/
   http://purl.org/net/dajobe/

                              2011-01-12                      librasqal(3)



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