/**
* Prepares everything for SparqlEngine-usage
* Loads the files, creates instances for SparqlEngine and
* Dataset...
*
* @return array First value is the sparql engine, second the dataset
*/
function _prepareSparql()
{
require_once RDFAPI_INCLUDE_DIR . 'sparql/SparqlEngine.php';
require_once RDFAPI_INCLUDE_DIR . 'dataset/DatasetMem.php';
$dataset = new DatasetMem();
$dataset->setDefaultGraph($this);
return array(SparqlEngine::factory($this), $dataset);
}
/**
* Performs a SPARQL query against a model. The model is converted to
* an RDF Dataset. The result can be retrived in SPARQL Query Results XML Format or
* as an array containing the variables an their bindings.
*
* @param String $query the sparql query string
* @param String $resultform the result form ('xml' for SPARQL Query Results XML Format)
* @return String/array
*/
function sparqlQuery($query, $resultform = false)
{
include_once RDFAPI_INCLUDE_DIR . PACKAGE_SPARQL;
include_once RDFAPI_INCLUDE_DIR . PACKAGE_DATASET;
$dataset = new DatasetMem();
$dataset->setDefaultGraph($this);
$parser = new SparqlParser();
$q = $parser->parse($query);
$eng = new SparqlEngine();
return $eng->queryModel($dataset, $q, $resultform);
}
