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diff --git a/linguistics/src/main/java/com/yahoo/language/process/Normalizer.java b/linguistics/src/main/java/com/yahoo/language/process/Normalizer.java
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+++ b/linguistics/src/main/java/com/yahoo/language/process/Normalizer.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.language.process;
+
+/**
+ * <p>This interface provides NFKC normalization of Strings through the underlying linguistics library.</p>
+ *
+ * @author <a href="mailto:mathiasm@yahoo-inc.com">Mathias M\u00F8lster Lidal</a>
+ */
+public interface Normalizer {
+
+    /**
+     * <p>NFKC normalizes a String.</p>
+     *
+     * @param input String to normalize.
+     * @return The normalized String.
+     * @throws ProcessingException If underlying library throws an Exception.
+     */
+    public String normalize(String input);
+}