diff --git a/src/fmu/dataio/providers/objectdata/__init__.py b/src/fmu/dataio/providers/objectdata/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/fmu/dataio/providers/objectdata/_base.py b/src/fmu/dataio/providers/objectdata/_base.py
index d8522a9ae..9e6e6f235 100644
--- a/src/fmu/dataio/providers/objectdata/_base.py
+++ b/src/fmu/dataio/providers/objectdata/_base.py
@@ -4,10 +4,9 @@
 from dataclasses import dataclass, field
 from datetime import datetime
 from pathlib import Path
-from typing import TYPE_CHECKING, Any, Dict, Final, Literal, Optional, TypeVar
+from typing import TYPE_CHECKING, Any, Final, TypeVar
 from warnings import warn
 
-from fmu.dataio import dataio, types
 from fmu.dataio._definitions import ConfigurationError
 from fmu.dataio._logging import null_logger
 from fmu.dataio._utils import generate_description, parse_timedata
@@ -16,7 +15,7 @@
 
 if TYPE_CHECKING:
     from fmu.dataio.dataio import ExportData
-    from fmu.dataio.types import Inferrable
+    from fmu.dataio.types import Classname, Efolder, Inferrable, Layout, Subtype
 
 logger: Final = null_logger(__name__)
 
@@ -25,51 +24,15 @@
 
 @dataclass
 class DerivedObjectDescriptor:
-    subtype: Literal[
-        "RegularSurface",
-        "Polygons",
-        "Points",
-        "RegularCube",
-        "CPGrid",
-        "CPGridProperty",
-        "DataFrame",
-        "JSON",
-        "ArrowTable",
-    ]
-    classname: Literal[
-        "surface",
-        "polygons",
-        "points",
-        "cube",
-        "cpgrid",
-        "cpgrid_property",
-        "table",
-        "dictionary",
-    ]
-    layout: Literal[
-        "regular",
-        "unset",
-        "cornerpoint",
-        "table",
-        "dictionary",
-    ]
-    efolder: (
-        Literal[
-            "maps",
-            "polygons",
-            "points",
-            "cubes",
-            "grids",
-            "tables",
-            "dictionaries",
-        ]
-        | str
-    )
+    subtype: Subtype
+    classname: Classname
+    layout: Layout
+    efolder: Efolder | str
     fmt: str
     extension: str
-    spec: Dict[str, Any] | None
-    bbox: Dict[str, Any] | None
-    table_index: Optional[list[str]]
+    spec: dict[str, Any] | None
+    bbox: dict[str, Any] | None
+    table_index: list[str] | None
 
 
 @dataclass
@@ -86,8 +49,8 @@ class DerivedNamedStratigraphy:
 
 
 def derive_name(
-    export: dataio.ExportData,
-    obj: types.Inferrable,
+    export: ExportData,
+    obj: Inferrable,
 ) -> str:
     """
     Derives and returns a name for an export operation based on the
@@ -128,8 +91,8 @@ class ObjectDataProvider(ABC):
     """
 
     # input fields
-    obj: types.Inferrable
-    dataio: dataio.ExportData
+    obj: Inferrable
+    dataio: ExportData
 
     # result properties; the most important is metadata which IS the 'data' part in
     # the resulting metadata. But other variables needed later are also given
@@ -216,7 +179,7 @@ def _process_content(self) -> tuple[str | dict, dict | None]:
 
         return content, content_spesific
 
-    def _derive_timedata(self) -> Optional[dict[str, str]]:
+    def _derive_timedata(self) -> dict[str, str] | None:
         """Format input timedata to metadata
 
         New format:
diff --git a/src/fmu/dataio/providers/objectdata/_provider.py b/src/fmu/dataio/providers/objectdata/_provider.py
index 2764afb1f..e968aa180 100644
--- a/src/fmu/dataio/providers/objectdata/_provider.py
+++ b/src/fmu/dataio/providers/objectdata/_provider.py
@@ -91,6 +91,7 @@
 
 import pandas as pd
 import xtgeo
+
 from fmu.dataio._definitions import ValidFormats
 from fmu.dataio._logging import null_logger
 
diff --git a/src/fmu/dataio/providers/objectdata/_tables.py b/src/fmu/dataio/providers/objectdata/_tables.py
index b3c759f4e..55e7da71f 100644
--- a/src/fmu/dataio/providers/objectdata/_tables.py
+++ b/src/fmu/dataio/providers/objectdata/_tables.py
@@ -4,6 +4,7 @@
 from typing import TYPE_CHECKING, Final
 
 import pandas as pd
+
 from fmu.dataio._definitions import STANDARD_TABLE_INDEX_COLUMNS, ValidFormats
 from fmu.dataio._logging import null_logger
 from fmu.dataio.datastructure.meta import specification
diff --git a/src/fmu/dataio/providers/objectdata/_xtgeo.py b/src/fmu/dataio/providers/objectdata/_xtgeo.py
index 47b5153b2..d4d34caf9 100644
--- a/src/fmu/dataio/providers/objectdata/_xtgeo.py
+++ b/src/fmu/dataio/providers/objectdata/_xtgeo.py
@@ -6,6 +6,7 @@
 import numpy as np
 import pandas as pd
 import xtgeo
+
 from fmu.dataio._definitions import ValidFormats
 from fmu.dataio._logging import null_logger
 from fmu.dataio._utils import npfloat_to_float