diff --git a/packages/overture-schema-system/src/overture/schema/system/optionality.py b/packages/overture-schema-system/src/overture/schema/system/optionality.py
index f4d50ff3d..326607a6a 100644
--- a/packages/overture-schema-system/src/overture/schema/system/optionality.py
+++ b/packages/overture-schema-system/src/overture/schema/system/optionality.py
@@ -1,4 +1,7 @@
-from enum import Enum
+"""
+Optional types.
+"""
+
 from types import NoneType, UnionType
 from typing import Annotated, Any, Generic, TypeVar, Union, get_args, get_origin
 
@@ -71,18 +74,6 @@ def __class_getitem__(cls, item: Any) -> Any:
         return Annotated[item | MISSING, Field(default=MISSING)]
 
 
-# todo - Vic - finish this
-class Optionality(str, Enum):
-    # This is for implementing the model constraints more cleverly.
-    #       Noneable -> It is allowed to be `null` in JSON Schema.
-    #                   To make it @required, need to take away the right to set `null`.
-    #
-    #
-    OMITABLE = ("omitable",)
-    NONEABLE = ("noneable",)
-    NOT_OPTIONAL = ("not_optional",)
-
-
 def _has_none(value: Any) -> bool:
     if value is None or value is NoneType:
         return True
diff --git a/packages/overture-schema-system/src/overture/schema/system/ref/ref.py b/packages/overture-schema-system/src/overture/schema/system/ref/ref.py
index a5e74cd94..7c37cc054 100644
--- a/packages/overture-schema-system/src/overture/schema/system/ref/ref.py
+++ b/packages/overture-schema-system/src/overture/schema/system/ref/ref.py
@@ -13,7 +13,7 @@
 
 
 class Relationship(str, DocumentedEnum):
-    """
+    r"""
     The kind of relationship that exists between two entities.
 
     Relationships represent connections between different features or models. Think of them as links
@@ -33,9 +33,9 @@ class Relationship(str, DocumentedEnum):
     relationship, is at the bottom.
 
                COMPOSITION
-               /         \\
+               /         \
          AGGREGATION   HIERARCHY
-               \\          /
+               \         /
                ASSOCIATION
 
     Note that the *kind* of a relationship does not say anything about the *directionality* of the