| Filterable | Interface to determine which elements can be filtered and to provide a way to set errors on the descriptor. |
| ClassFactory | Retrieves a series of filters to manipulate a specific Descriptor with during building. |
| Filter | Filter used to manipulate a descriptor after being build. |
| StripIgnore | Strips any Descriptor if the ignore tag is present with that element. |
| StripInternal | Filters a Descriptor when the @internal inline tag, or normal tag, is used. |
| StripOnVisibility | Strips any Descriptor if their visibility is allowed according to the ProjectDescriptorBuilder. |