/**
* Returns given Node instance in SPARQL format, which is in NQuads or as Variable
*
* @param Node $node Node instance to format.
* @param string $var The variablename, which should be used, if the node is not concrete
* @return string Either NQuad notation (if node is concrete) or as variable.
*/
public static function getNodeInSparqlFormat(Node $node, $var = null)
{
if ($node->isConcrete()) {
return $node->toNQuads();
}
if ($var == null) {
$var = uniqid('tempVar');
}
return '?' . $var;
}
