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diff --git a/src/org/xbill/DNS/Credibility.java b/src/org/xbill/DNS/Credibility.java
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+++ b/src/org/xbill/DNS/Credibility.java
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+// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
+
+package org.xbill.DNS;
+
+/**
+ * Constants relating to the credibility of cached data, which is based on
+ * the data's source.  The constants NORMAL and ANY should be used by most
+ * callers.
+ * @see Cache
+ * @see Section
+ *
+ * @author Brian Wellington
+ */
+
+public final class Credibility {
+
+private
+Credibility() {}
+
+/** A hint or cache file on disk. */
+public static final int HINT			= 0;
+
+/** The additional section of a response. */
+public static final int ADDITIONAL		= 1;
+
+/** The additional section of a response. */
+public static final int GLUE			= 2;
+
+/** The authority section of a nonauthoritative response. */
+public static final int NONAUTH_AUTHORITY	= 3;
+
+/** The answer section of a nonauthoritative response. */
+public static final int NONAUTH_ANSWER		= 3;
+
+/** The authority section of an authoritative response. */
+public static final int AUTH_AUTHORITY		= 4;
+
+/** The answer section of a authoritative response. */
+public static final int AUTH_ANSWER		= 4;
+
+/** A zone. */
+public static final int ZONE			= 5;
+
+/** Credible data. */
+public static final int NORMAL			= 3;
+
+/** Data not required to be credible. */
+public static final int ANY			= 1;
+
+}