Get a single literal value for a property of the resource
If multiple values are set for a property then the value returned may be arbitrary.
This method will return null if there is not literal value for the property.
string|array $property The name of the property (e.g. foaf:name):
string $lang The language to filter by (e.g. en):
object EasyRdf_Literal Literal value associated with the property
public function getLiteral($property, $lang = null) {
$this
->checkHasGraph();
return $this->graph
->get($this->uri, $property, 'literal', $lang);
}