public function hasIdentifierPropertiesOnly() {
		if ($this->attributes !== null && $this->attributes->isEmpty() === false) {
			return false;
		}
		if ($this->relationships !== null && $this->relationships->isEmpty() === false) {
			return false;
		}
		if ($this->links !== null && $this->links->isEmpty() === false) {
			return false;
		}
		
		return true;
	}
public function hasIdentifierPropertiesOnly() {
		if ($this->attributes !== null && $this->attributes->isEmpty() === false) {
			return false;
		}
		if ($this->relationships !== null && $this->relationships->isEmpty() === false) {
			return false;
		}
		if ($this->links !== null && $this->links->isEmpty() === false) {
			return false;
		}
		
		return true;
	}
public function hasIdentifierPropertiesOnly ( ) { if ( $ this -> attributes !== null && $ this -> attributes -> isEmpty ( ) === false ) { return false ; } if ( $ this -> relationships !== null && $ this -> relationships -> isEmpty ( ) === false ) { return false ; } if ( $ this -> links !== null && $ this -> links -> isEmpty ( ) === false ) { return false ; } return true ; }
whether the ResourceObject is empty except for the ResourceIdentifierObject

this can be used to determine if a Relationship's resource could be added as included resource

@internal

@return boolean
whether the ResourceObject is empty except for the ResourceIdentifierObject