diff --git a/odxtools/database.py b/odxtools/database.py
index f6ec1e45..dafc0449 100644
--- a/odxtools/database.py
+++ b/odxtools/database.py
@@ -1,9 +1,10 @@
 # SPDX-License-Identifier: MIT
 from itertools import chain
 from pathlib import Path
-from typing import IO, Any, Dict, List, Optional, OrderedDict
+from typing import IO, Any, Dict, List, Optional, OrderedDict, Union
 from xml.etree import ElementTree
 from zipfile import ZipFile
+from os import PathLike
 
 from packaging.version import Version
 
@@ -27,10 +28,7 @@ class Database:
     into a single PDX file.
     """
 
-    def __init__(self,
-                 *,
-                 pdx_zip: Optional[ZipFile] = None,
-                 odx_d_file_name: Optional[str] = None) -> None:
+    def __init__(self) -> None:
         self.model_version: Optional[Version] = None
         self.auxiliary_files: OrderedDict[str, IO[bytes]] = OrderedDict()
 
@@ -39,9 +37,14 @@ def __init__(self,
         self._comparam_subsets = NamedItemList[ComparamSubset]()
         self._comparam_specs = NamedItemList[ComparamSpec]()
 
-    def add_pdx_file(self, pdx_file_name: str) -> None:
-        pdx_zip = ZipFile(pdx_file_name)
-
+    def add_pdx_file(self, pdx_file: Union[str, "PathLike[Any]", IO[bytes], ZipFile]) -> None:
+        """Add PDX file to database.
+        Either pass the path to the file, an IO with the file content or a ZipFile object.
+        """
+        if isinstance(pdx_file, ZipFile):
+            pdx_zip = pdx_file
+        else:
+            pdx_zip = ZipFile(pdx_file)
         for zip_member in pdx_zip.namelist():
             # The name of ODX files can end with .odx, .odx-d,
             # .odx-c, .odx-cs, .odx-e, .odx-f, .odx-fd, .odx-m,
@@ -54,16 +57,16 @@ def add_pdx_file(self, pdx_file_name: str) -> None:
             elif p.name.lower() != "index.xml":
                 self.add_auxiliary_file(zip_member, pdx_zip.open(zip_member))
 
-    def add_odx_file(self, odx_file_name: str) -> None:
+    def add_odx_file(self, odx_file_name: Union[str, "PathLike[Any]"]) -> None:
         self._process_xml_tree(ElementTree.parse(odx_file_name).getroot())
 
     def add_auxiliary_file(self,
-                           aux_file_name: str,
+                           aux_file_name: Union[str, "PathLike[Any]"],
                            aux_file_obj: Optional[IO[bytes]] = None) -> None:
         if aux_file_obj is None:
             aux_file_obj = open(aux_file_name, "rb")
 
-        self.auxiliary_files[aux_file_name] = aux_file_obj
+        self.auxiliary_files[str(aux_file_name)] = aux_file_obj
 
     def _process_xml_tree(self, root: ElementTree.Element) -> None:
         dlcs: List[DiagLayerContainer] = []