| Name | Description | Type | Package | Framework |
| AttributeNames | Constants for common attribute names, only for the use in Carrot2 core code. | Class | org.carrot2.core.attribute | Carrot |
| CommonAttributes | Attributes shared and inherited by many clustering algorithms. | Class | org.carrot2.core.attribute | Carrot |
| CommonAttributesDescriptor | Metadata and attributes of the CommonAttributes component. | Class | org.carrot2.core.attribute | Carrot |
| CommonAttributesDescriptor .AttributeBuilder | Attribute map builder for the CommonAttributes component. | Class | org.carrot2.core.attribute | Carrot |
| CommonAttributesDescriptor .Attributes | All attributes of the CommonAttributes component. | Class | org.carrot2.core.attribute | Carrot |
| CommonAttributesDescriptor .Keys | Constants for all attribute keys of the CommonAttributes component. | Class | org.carrot2.core.attribute | Carrot |
| Init | Class | org.carrot2.core.attribute | Carrot | |
| Internal | Denotes attributes the end-user applications may not want to display in their UserOptional Element Summary | Class | org.carrot2.core.attribute | Carrot |
| InternalAttributePredicate | A predicate that tests whether an AttributeDescriptor refers to an Internal attribute. | Class | org.carrot2.core.attribute | Carrot |
| Processing | Class | org.carrot2.core.attribute | Carrot | |