/**
  * @since 2.1
  *
  * @return SemanticData
  */
 public function getDependencies()
 {
     $semanticData = parent::getDependencies();
     $titleProperty = new TitleProperty();
     $yearProperty = new YearProperty();
     $semanticData->addPropertyObjectValue(new DIProperty('_LIST'), new DIBlob($titleProperty->getProperty()->getKey() . ';' . $yearProperty->getProperty()->getKey()));
     return $semanticData;
 }
 /**
  * @since 2.1
  *
  * @see https://en.wikipedia.org/wiki/Demographics_of_Paris
  *
  * @return Subobject
  */
 public function getDemographics()
 {
     if ($this->targetSubject === null) {
         throw new RuntimeException('Expected a target subject');
     }
     $subobject = new Subobject($this->targetSubject->getTitle());
     $subobject->setEmptyContainerForId('Paris#Demographics');
     $yearProperty = new YearProperty();
     $yearDataValue = $this->dataValueFactory->newPropertyObjectValue($yearProperty->getProperty(), '2009');
     $subobject->addDataValue($yearDataValue);
     $subobject->addDataValue($this->getAreaValue());
     $subobject->addDataValue($this->getPopulationValue());
     $subobject->addDataValue($this->getPopulationDensityValue());
     return $subobject;
 }