/**
* Create a new LibRDF_Serializer.
*
* Name is the name of the serializer to use. Common choices are
* "rdfxml", "ntriples" and "turtle".
*
* The "rdfxml" serializer is not pretty, outputing a flat list of
* one XML element per statement. "rdfxml-abbrev" is a bit nicer, but
* slower.
*
* @param string $name The name of the serializer to use
* @param string $mime_type The MIME type of the syntax
* @param string $type_uri The URI of the syntax
* @return void
* @throws LibRDF_Error If unable to create a new serializer
* @access public
*/
public function __construct($name, $mime_type = NULL, $type_uri = NULL)
{
if ($type_uri) {
$type_uri = new LibRDF_URI($type_uri);
}
$this->serializer = librdf_new_serializer(librdf_php_get_world(), $name, $mime_type, $type_uri ? $type_uri->getURI : $type_uri);
if (!$this->serializer) {
throw new LibRDF_Error("Unable to create new serializer");
}
foreach (self::$namespaces as $uri => $prefix) {
$this->setNamespace($uri, $prefix);
}
}
$nval = '(unbound)';
}
print " " . librdf_query_results_get_binding_name($results, $i) . "=" . $nval . "\n";
}
print "}\n";
librdf_query_results_next($results);
$count++;
}
if ($results) {
print "Returned {$count} results\n";
}
$results = null;
print "\nExecuting query again\n";
$results = librdf_model_query_execute($model, $query);
if ($results) {
$str = librdf_query_results_to_string($results, null, null);
print "Query results serialized to an XML string size " . strlen($str) . " bytes\n";
} else {
print "Query results couldn't be serialized to an XML string\n";
}
$serializer = librdf_new_serializer($world, 'rdfxml', null, null);
print "Redland serializer created\n";
$base = librdf_new_uri($world, 'http://example.org/base.rdf');
print "Serializing...\n";
librdf_serializer_serialize_model_to_file($serializer, './test-out.rdf', $base, $model);
print "Done...\n";
librdf_free_serializer($serializer);
librdf_free_uri($base);
librdf_free_model($model);
librdf_free_storage($storage);
print "Done\n";
function CONSTRUCT($query, $base_uri = null)
{
if (is_null($base_uri)) {
$base_uri = $this->_base_uri;
}
timings($query);
$q = librdf_new_query($this->_world, 'sparql', null, $query, $base_uri);
$r = librdf_model_query_execute($this->_model, $q);
$r_stream = librdf_query_results_as_stream($r);
$r_store = librdf_new_storage($this->_world, 'memory', '', null);
$r_model = librdf_new_model($this->_world, $r_store, null);
librdf_model_add_statements($r_model, $r_stream);
librdf_free_stream($r_stream);
$serializer = librdf_new_serializer($this->_world, 'json', null, null);
$r = librdf_serializer_serialize_model_to_string($serializer, null, $r_model);
librdf_free_serializer($serializer);
$r = json_decode($r, 1);
if (is_null($r)) {
$r = array();
}
librdf_free_model($r_model);
librdf_free_storage($r_store);
librdf_free_query($q);
timings();
return $r;
}