bionic (3) librasqal.3.gz

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)