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librasqal(3) 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 ma- nipulation 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 lan- guage, some of SPARQL 1.1 draft and fully supports RDQL. Rasqal uses the libraptor(3) library for providing URI handling, WWW con- tent 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/ API CHANGES See the Raptor API docs changes section at http://li- brdf.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/ 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/ RDQL - A Query Language for RDF, Andy Seaborne, W3C Member Submission 9 January 2004 http://www.w3.org/Submission/2004/SUBM-RDQL-20040109/ SEE ALSO roqet(1),libraptor(3) AUTHOR Dave Beckett - http://purl.org/net/dajobe/ 2011-01-12 librasqal(3)
NAME | SYNOPSIS | DESCRIPTION | API REFERENCE | API CHANGES | CONFORMING TO | SEE ALSO | AUTHOR
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