diff --git a/src/Umbraco.Core/Models/ContentBase.cs b/src/Umbraco.Core/Models/ContentBase.cs
index 84fd5f1495..8ffc4dc101 100644
--- a/src/Umbraco.Core/Models/ContentBase.cs
+++ b/src/Umbraco.Core/Models/ContentBase.cs
@@ -81,7 +81,7 @@ namespace Umbraco.Core.Models
 	            var val = _parentId.Value;
 				if (val == 0)
 				{
-					throw new InvalidOperationException("The ParentId cannot be a value of 0. Perhaps the parent object used to instantiate this object has not been persisted to the data store.");
+					throw new InvalidOperationException("The ParentId cannot have a value of 0. Perhaps the parent object used to instantiate this object has not been persisted to the data store.");
 				}
 				return val;
             }
diff --git a/src/Umbraco.Core/Models/EntityBase/IUmbracoEntity.cs b/src/Umbraco.Core/Models/EntityBase/IUmbracoEntity.cs
index 2810c9a4d3..7ae9422a25 100644
--- a/src/Umbraco.Core/Models/EntityBase/IUmbracoEntity.cs
+++ b/src/Umbraco.Core/Models/EntityBase/IUmbracoEntity.cs
@@ -1,6 +1,6 @@
 namespace Umbraco.Core.Models.EntityBase
 {
-    internal interface IUmbracoEntity : IEntity
+    public interface IUmbracoEntity : IAggregateRoot
     {
         /// <summary>
         /// Gets or sets the Id of the Parent entity
diff --git a/src/Umbraco.Core/Models/IContentBase.cs b/src/Umbraco.Core/Models/IContentBase.cs
index 48fe6019fb..7f7ae49c96 100644
--- a/src/Umbraco.Core/Models/IContentBase.cs
+++ b/src/Umbraco.Core/Models/IContentBase.cs
@@ -8,44 +8,13 @@ namespace Umbraco.Core.Models
     /// Defines the base for a Content object with properties that
     /// are shared between Content and Media.
     /// </summary>
-    public interface IContentBase : IAggregateRoot
+    public interface IContentBase : IUmbracoEntity
     {
-        /// <summary>
-        /// Gets or Sets the Id of the Parent for the Content
-        /// </summary>
-        int ParentId { get; set; }
-
         /// <summary>
         /// Gets or Sets the Name of the Content
         /// </summary>
         string Name { get; set; }
-
-        /// <summary>
-        /// Gets or Sets the Sort Order of the Content
-        /// </summary>
-        int SortOrder { get; set; }
-
-        /// <summary>
-        /// Gets or Sets the Level of the Content
-        /// </summary>
-        int Level { get; set; }
-
-        /// <summary>
-        /// Gets or Sets the Path of the Content
-        /// </summary>
-        string Path { get; set; }
-
-        /// <summary>
-        /// Id of the user who created the Content
-        /// </summary>
-        int CreatorId { get; set; }
-
-        /// <summary>
-        /// Boolean indicating whether this Content is Trashed or not.
-        /// If Content is Trashed it will be located in the Recyclebin.
-        /// </summary>
-        bool Trashed { get; }
-        
+       
         /// <summary>
         /// Integer Id of the default ContentType
         /// </summary>
diff --git a/src/Umbraco.Core/Models/IContentTypeBase.cs b/src/Umbraco.Core/Models/IContentTypeBase.cs
index bdbdb48e47..db1a86f4e9 100644
--- a/src/Umbraco.Core/Models/IContentTypeBase.cs
+++ b/src/Umbraco.Core/Models/IContentTypeBase.cs
@@ -8,7 +8,7 @@ namespace Umbraco.Core.Models
     /// Defines the base for a ContentType with properties that
     /// are shared between ContentTypes and MediaTypes.
     /// </summary>
-    public interface IContentTypeBase : IAggregateRoot
+    public interface IContentTypeBase : IUmbracoEntity
     {
         /// <summary>
         /// Gets or Sets the Alias of the ContentType
@@ -20,31 +20,11 @@ namespace Umbraco.Core.Models
         /// </summary>
         string Name { get; set; }
 
-        /// <summary>
-        /// Gets or Sets the Id of Parent of the ContentType
-        /// </summary>
-        int ParentId { get; set; }
-
-        /// <summary>
-        /// Gets or Sets the Level of the Content
-        /// </summary>
-        int Level { get; set; }
-
-        /// <summary>
-        /// Gets or Sets the Path of the Content
-        /// </summary>
-        string Path { get; set; }
-
         /// <summary>
         /// Gets or Sets the Description for the ContentType
         /// </summary>
         string Description { get; set; }
 
-        /// <summary>
-        /// Gets or Sets the Sort Order of the ContentType
-        /// </summary>
-        int SortOrder { get; set; }
-
         /// <summary>
         /// Gets or Sets the Icon for the ContentType
         /// </summary>
@@ -55,11 +35,6 @@ namespace Umbraco.Core.Models
         /// </summary>
         string Thumbnail { get; set; }
 
-        /// <summary>
-        /// Gets or Sets the Id of the User who created the ContentType
-        /// </summary>
-        int CreatorId { get; set; }
-
         /// <summary>
         /// Gets or Sets a boolean indicating whether this ContentType is allowed at the root
         /// </summary>
diff --git a/src/Umbraco.Core/Models/IDataTypeDefinition.cs b/src/Umbraco.Core/Models/IDataTypeDefinition.cs
index 12b5f4ddb5..3b1391ae8d 100644
--- a/src/Umbraco.Core/Models/IDataTypeDefinition.cs
+++ b/src/Umbraco.Core/Models/IDataTypeDefinition.cs
@@ -1,64 +1,23 @@
 using System;
-using System.Runtime.Serialization;
 using Umbraco.Core.Models.EntityBase;
 
 namespace Umbraco.Core.Models
 {
-    public interface IDataTypeDefinition : IAggregateRoot
+    public interface IDataTypeDefinition : IUmbracoEntity
     {
-        /// <summary>
-        /// Gets or sets the Id of the Parent entity
-        /// </summary>
-        /// <remarks>Might not be necessary if handled as a relation?</remarks>
-        [DataMember]
-        int ParentId { get; set; }
-
         /// <summary>
         /// Gets or sets the name of the current entity
         /// </summary>
-        [DataMember]
         string Name { get; set; }
 
-        /// <summary>
-        /// Gets or sets the sort order of the content entity
-        /// </summary>
-        [DataMember]
-        int SortOrder { get; set; }
-
-        /// <summary>
-        /// Gets or sets the level of the content entity
-        /// </summary>
-        [DataMember]
-        int Level { get; set; }
-
-        /// <summary>
-        /// Gets or sets the path
-        /// </summary>
-        [DataMember]
-        string Path { get; set; }
-
-        /// <summary>
-        /// Id of the user who created this entity
-        /// </summary>
-        [DataMember]
-        int CreatorId { get; set; }
-
-        /// <summary>
-        /// Boolean indicating whether this entity is Trashed or not.
-        /// </summary>
-        [DataMember]
-        bool Trashed { get; }
-
         /// <summary>
         /// Id of the DataType control
         /// </summary>
-        [DataMember]
         Guid ControlId { get; }
 
         /// <summary>
         /// Gets or Sets the DatabaseType for which the DataType's value is saved as
         /// </summary>
-        [DataMember]
         DataTypeDatabaseType DatabaseType { get; set; }
     }
 }
\ No newline at end of file