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diff --git a/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/apple/ApplePlatformTypeApi.java b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/apple/ApplePlatformTypeApi.java
new file mode 100644
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+++ b/src/main/java/com/google/devtools/build/lib/skylarkbuildapi/apple/ApplePlatformTypeApi.java
@@ -0,0 +1,42 @@
+// Copyright 2018 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.skylarkbuildapi.apple;
+
+import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkValue;
+
+/**
+ * Interface for a descriptor for an Apple platform type, such as such as iOS or macOS.
+ */
+@SkylarkModule(
+  name = "apple_platform_type",
+  category = SkylarkModuleCategory.NONE,
+  doc = "Describes an Apple \"platform type\", such as iOS, macOS, tvOS, or watchOS. This is "
+      + "distinct from a \"platform\", which is the platform type combined with one or more CPU "
+      + "architectures.<p>"
+      + "Specific instances of this type can be retrieved by accessing the fields of the "
+      + "<a href='apple_common.html#platform_type'>apple_common.platform_type</a>:<br><ul>"
+      + "<li><code>apple_common.platform_type.ios</code></li>"
+      + "<li><code>apple_common.platform_type.macos</code></li>"
+      + "<li><code>apple_common.platform_type.tvos</code></li>"
+      + "<li><code>apple_common.platform_type.watchos</code></li>"
+      + "</ul><p>"
+      + "Likewise, the platform type of an existing platform value can be retrieved using its "
+      + "<code>platform_type</code> field.<p>"
+      + "Platform types can be converted to a lowercase string (e.g., <code>ios</code> or "
+      + "<code>macos</code>) using the <a href='globals.html#str'>str</a> function."
+)
+public interface ApplePlatformTypeApi extends SkylarkValue {}