diff --git a/lib/newfol/database.py b/lib/newfol/database.py
index c24d59f..06ab5cb 100644
--- a/lib/newfol/database.py
+++ b/lib/newfol/database.py
@@ -38,7 +38,15 @@ class DatabaseVersion(int):
 
         Returns None if compression is not enabled.
         """
-        return (None, "xz")[self.compression_version()]
+        return self.compression_types()[self.compression_version()]
+
+    @staticmethod
+    def compression_types():
+        """A tuple containing supported compression types.
+
+        None is used to indicate the lack of compression.
+        """
+        return (None, "xz")
 
     def serialization_version(self):
         """The value indicating the format in which the data is serialized."""
@@ -49,7 +57,12 @@ class DatabaseVersion(int):
 
         This value is suitable for passing to a FileStorage object.
         """
-        return ("csv", "pickle", "json")[self.serialization_version()]
+        return self.serialization_types()[self.serialization_version()]
+
+    @staticmethod
+    def serialization_types():
+        """A tuple indicating the formats in which data can be serialized."""
+        return ("csv", "pickle", "json")
 
     def record_version(self):
         """The record version.