protected function prep_contents()
	{
		$properties = array(
			'created'          => $this->created,
			'expiration'       => $this->expiration,
			'dependencies'     => $this->dependencies,
			'content_handler'  => $this->content_handler
		);
		$properties = '{{'.self::PROPS_TAG.'}}'.json_encode($properties).'{{/'.self::PROPS_TAG.'}}';

		return $properties.$this->contents;
	}