New entity types handling

Closes #184 (closed)

arkindex_worker/worker/__init__.py

@@ -19,7 +19,7 @@ from arkindex_worker.reporting import Reporter
 from arkindex_worker.worker.base import BaseWorker
 from arkindex_worker.worker.classification import ClassificationMixin
 from arkindex_worker.worker.element import ElementMixin
-from arkindex_worker.worker.entity import EntityMixin, EntityType  # noqa: F401
+from arkindex_worker.worker.entity import EntityMixin  # noqa: F401
 from arkindex_worker.worker.metadata import MetaDataMixin, MetaType  # noqa: F401
 from arkindex_worker.worker.transcription import TranscriptionMixin
 from arkindex_worker.worker.version import WorkerVersionMixin  # noqa: F401
@@ -92,6 +92,10 @@ class ElementsWorker(
 
         self.classes = {}
 
+        self.entity_types = {}
+        """Known and available entity types in processed corpus
+        """
+
         self._worker_version_cache = {}
 
     def list_elements(self) -> Union[Iterable[CachedElement], List[str]]: