public function getVariableDetails( $variable, $includePrefix = true )
	{
		$result = array( 'value' => $this->valueToString( $variable, $includePrefix ) );
		if ( $variable instanceof DOMXPathNavigator )
		{
			$result['concept'] = $variable->getName();
			$result['context'] = FactValues::getContextRef( $variable );
			$result['unit'] = FactValues::getUnitRef( $variable );

		}
		return $result;
	}