code: public function updateTagging($fusionID) {
  
  		// Determine any data objects with the tagging extension.
  
  		$configuration = Config::inst();
  		$classes = ClassInfo::subclassesFor('DataObject');
  		unset($classes['DataObject']);
  		foreach($classes as $class) {
  
  			// Determine the specific data object extensions.
  
  			$extensions = $configuration->get($class, 'extensions', Config::UNINHERITED);
  			if(is_array($extensions) && in_array('TaggingExtension', $extensions)) {
  
  				// Determine whether this fusion tag is being used.
  
  				$mode = Versioned::get_reading_mode();
  				Versioned::reading_stage('Stage');
  				$objects = $class::get()->filter('FusionTags.ID', $fusionID);
  
  				// Update the searchable content tagging for these data objects.
  
  				if($class::has_extension($class, 'Versioned')) {
  
  					// These data objects are versioned.
  
  					foreach($objects as $object) {
  
  						// Update the staging version.
  
  						$object->writeWithoutVersion();
  					}
  					Versioned::reading_stage('Live');
  					$objects = $class::get()->filter('FusionTags.ID', $fusionID);
  					foreach($objects as $object) {
  
  						// Update the live version.
  
  						$object->writeWithoutVersion();
  					}
  				}
  				else {
  
  					// These data objects are not versioned.
  
  					foreach($objects as $object) {
  						$object->write();
  					}
  				}
  				Versioned::set_reading_mode($mode);
  			}
  		}
  	}
docs: Update the searchable content tagging for a specific fusion tag.
  
  @parameter <{FUSION_TAG_ID}> integer