| Name | Description | Type | Package | Framework |
| FeatureId | Features are identified as strings. | Interface | org.opengis.filter.identity | GeoTools |
| GmlObjectId | Feature and Geometry identifier for GML3 specification. | Interface | org.opengis.filter.identity | GeoTools |
| Identifier | An object identifier. | Interface | org.opengis.filter.identity | GeoTools |
| ObjectId | ObjectId refered to by Filter 1. | Interface | org.opengis.filter.identity | GeoTools |
| RecordId | RecordId refered to by CSW-2 specification. | Interface | org.opengis.filter.identity | GeoTools |
| ResourceId | Resource identifier as per FES 2. | Interface | org.opengis.filter.identity | GeoTools |
| Version | Union type class for the Version Union type in FES 2. | Class | org.opengis.filter.identity | GeoTools |
| Version .Action | The VersionAction attribute may also be the strings FIRST, LATEST, PREVIOUS, NEXT and ALL. | Class | org.opengis.filter.identity.Version | GeoTools |