- $this->logFeatureUsage( 'action=expandtemplates&!prop' );
- $this->setWarning( 'Because no values have been specified for the prop parameter, a ' .
- 'legacy format has been used for the output. This format is deprecated, and in ' .
- 'the future, a default value will be set for the prop parameter, causing the new' .
- 'format to always be used.' );