/** * @return ValueSnakRdfBuilderFactory */ public function getValueSnakRdfBuilderFactory() { if ($this->valueSnakRdfBuilderFactory === null) { $this->valueSnakRdfBuilderFactory = new ValueSnakRdfBuilderFactory($this->dataTypeDefinitions->getRdfBuilderFactoryCallbacks(DataTypeDefinitions::PREFIXED_MODE)); } return $this->valueSnakRdfBuilderFactory; }