diff --git a/pyVHDLModel/PSLModel.py b/pyVHDLModel/PSLModel.py
index 14cef8037..0412384ba 100644
--- a/pyVHDLModel/PSLModel.py
+++ b/pyVHDLModel/PSLModel.py
@@ -78,4 +78,12 @@ def __init__(self, identifier: str):
 
 @export
 class DefaultClock(PSLEntity):
-	pass
+	_identifier: str
+
+	def __init__(self, identifier: str):
+		super().__init__()
+		self._identifier = identifier
+
+	@property
+	def Identifier(self) -> str:
+		return self._identifier
diff --git a/pyVHDLModel/VHDLModel.py b/pyVHDLModel/VHDLModel.py
index 13692d71a..19cacf1c5 100644
--- a/pyVHDLModel/VHDLModel.py
+++ b/pyVHDLModel/VHDLModel.py
@@ -1982,17 +1982,35 @@ def Subtype(self):
 
 @export
 class AttributeSpecification(ModelEntity):
+	_identifiers: List[Name]
 	_attribute: Name
+	_entityClass: EntityClass
+	_expression: Expression
 
-	def __init__(self, attribute: Name):
+	def __init__(self, identifiers: List[Name], attribute: Name, entityClass: EntityClass, expression: Expression):
 		super().__init__()
 
+		self._identifiers = identifiers
 		self._attribute = attribute
+		self._entityClass = entityClass
+		self._expression = expression
 
 	@property
-	def Attribute(self) -> Attribute:
+	def Identifiers(self) -> List[Name]:
+		return self._identifiers
+
+	@property
+	def Attribute(self) -> Name:
 		return self._attribute
 
+	@property
+	def EntityClass(self) -> EntityClass:
+		return self._entityClass
+
+	@property
+	def Expression(self) -> Expression:
+		return self._expression
+
 
 @export
 class InterfaceItem: