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librasqal(3)          DragonFly Library Functions Manual          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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