Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Data.Entity/System/Data/Objects/DataClasses/EdmPropertyAttribute.cs

@@ -0,0 +1,32 @@
+//---------------------------------------------------------------------
+// <copyright file="EdmPropertyAttribute.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner       [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+namespace System.Data.Objects.DataClasses
+{
+    using System;
+
+#pragma warning disable 3015 // no accessible constructors which use only CLS-compliant types
+
+    /// <summary>
+    /// Base attribute for properties mapped to store elements.
+    /// Implied default AttributeUsage properties Inherited=True, AllowMultiple=False,
+    /// The metadata system expects this and will only look at the first of each of these attributes, even if there are more.
+    /// </summary>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Edm")]
+    [AttributeUsage(AttributeTargets.Property)]
+    public abstract class EdmPropertyAttribute: System.Attribute
+    {
+        /// <summary>
+        /// Only allow derived attributes from this assembly
+        /// </summary>
+        internal EdmPropertyAttribute()
+        {
+        }
+    }
+}