| Name | Description | Type | Package | Framework |
| FixedExtractor | value for a fixed meta-data key, when a given annotation is present. | Class | org.apache.tapestry5.services.meta | Apache Tapestry |
| MetaDataExtractor | Used to extract a meta data value from a component annotation. | Interface | org.apache.tapestry5.services.meta | Apache Tapestry |
| MetaDataLocator | Used to lookup meta data concerning a particular component. | Interface | org.apache.tapestry5.services | Apache Tapestry |
| MetaWorker | Service that makes it easy to identify a class annotation and use its presence, or the value of an attribute, to set a meta-data key. | Interface | org.apache.tapestry5.services.meta | Apache Tapestry |