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diff --git a/intl/icu/source/i18n/collationtailoring.h b/intl/icu/source/i18n/collationtailoring.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2013-2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* collationtailoring.h
+*
+* created on: 2013mar12
+* created by: Markus W. Scherer
+*/
+
+#ifndef __COLLATIONTAILORING_H__
+#define __COLLATIONTAILORING_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_COLLATION
+
+#include "unicode/locid.h"
+#include "unicode/unistr.h"
+#include "unicode/uversion.h"
+#include "collationsettings.h"
+#include "uhash.h"
+#include "umutex.h"
+#include "unifiedcache.h"
+ 
+
+struct UDataMemory;
+struct UResourceBundle;
+struct UTrie2;
+
+U_NAMESPACE_BEGIN
+
+struct CollationData;
+
+class UnicodeSet;
+
+/**
+ * Collation tailoring data & settings.
+ * This is a container of values for a collation tailoring
+ * built from rules or deserialized from binary data.
+ *
+ * It is logically immutable: Do not modify its values.
+ * The fields are public for convenience.
+ *
+ * It is shared, reference-counted, and auto-deleted; see SharedObject.
+ */
+struct U_I18N_API CollationTailoring : public SharedObject {
+    CollationTailoring(const CollationSettings *baseSettings);
+    virtual ~CollationTailoring();
+
+    /**
+     * Returns true if the constructor could not initialize properly.
+     */
+    UBool isBogus() { return settings == nullptr; }
+
+    UBool ensureOwnedData(UErrorCode &errorCode);
+
+    static void makeBaseVersion(const UVersionInfo ucaVersion, UVersionInfo version);
+    void setVersion(const UVersionInfo baseVersion, const UVersionInfo rulesVersion);
+    int32_t getUCAVersion() const;
+
+    // data for sorting etc.
+    const CollationData *data;  // == base data or ownedData
+    const CollationSettings *settings;  // reference-counted
+    UnicodeString rules;
+    // The locale is bogus when built from rules or constructed from a binary blob.
+    // It can then be set by the service registration code which is thread-safe.
+    mutable Locale actualLocale;
+    // UCA version u.v.w & rules version r.s.t.q:
+    // version[0]: builder version (runtime version is mixed in at runtime)
+    // version[1]: bits 7..3=u, bits 2..0=v
+    // version[2]: bits 7..6=w, bits 5..0=r
+    // version[3]= (s<<5)+(s>>3)+t+(q<<4)+(q>>4)
+    UVersionInfo version;
+
+    // owned objects
+    CollationData *ownedData;
+    UObject *builder;
+    UDataMemory *memory;
+    UResourceBundle *bundle;
+    UTrie2 *trie;
+    UnicodeSet *unsafeBackwardSet;
+    mutable UHashtable *maxExpansions;
+    mutable UInitOnce maxExpansionsInitOnce;
+
+private:
+    /**
+     * No copy constructor: A CollationTailoring cannot be copied.
+     * It is immutable, and the data trie cannot be copied either.
+     */
+    CollationTailoring(const CollationTailoring &other) = delete;
+};
+
+struct U_I18N_API CollationCacheEntry : public SharedObject {
+    CollationCacheEntry(const Locale &loc, const CollationTailoring *t)
+            : validLocale(loc), tailoring(t) {
+        if(t != nullptr) {
+            t->addRef();
+        }
+    }
+    ~CollationCacheEntry();
+
+    Locale validLocale;
+    const CollationTailoring *tailoring;
+};
+
+template<> U_I18N_API
+const CollationCacheEntry *
+LocaleCacheKey<CollationCacheEntry>::createObject(const void *creationContext,
+                                                  UErrorCode &errorCode) const;
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_COLLATION
+#endif  // __COLLATIONTAILORING_H__