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diff --git a/libpoldiff/src/range_internal.h b/libpoldiff/src/range_internal.h
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+++ b/libpoldiff/src/range_internal.h
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+/**
+ *  @file
+ *  Protected interface for range differences.
+ *
+ *  @author Jeremy A. Mowery jmowery@tresys.com
+ *  @author Jason Tang jtang@tresys.com
+ *
+ *  Copyright (C) 2006-2007 Tresys Technology, LLC
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef POLDIFF_RANGE_INTERNAL_H
+#define POLDIFF_RANGE_INTERNAL_H
+
+#ifdef	__cplusplus
+extern "C"
+{
+#endif
+
+/**
+ * Allocate and return a poldiff_range_t object.  This will fill in
+ * the orig_range and mod_range strings.  If the form is modified,
+ * then this will allocate the levels vector but leave it empty.
+ * Otherwise the levels vector will be filled with the levels that
+ * were added/removed.
+ *
+ * @param diff Diff object containing policies.
+ * @param orig_range Range from original policy, or NULL if there is
+ * no original range.
+ * @param mod_range Range from modified policy, or NULL if there is no
+ * modified range.
+ * @param form Form of the range.
+ *
+ * @return An initialized range, or NULL upon error.  Caller must call
+ * range_destroy() upon the returned value.
+ */
+	poldiff_range_t *range_create(const poldiff_t * diff, const qpol_mls_range_t * orig_range,
+				      const qpol_mls_range_t * mod_range, poldiff_form_e form);
+
+/**
+ * Deallocate all space for a range, including the pointer itself.
+ * Afterwards set the pointer to NULL.
+ *
+ * @param range Reference to a range to destroy.
+ */
+	void range_destroy(poldiff_range_t ** range);
+
+/**
+ * Calculate the differences between two ranges (that are stored
+ * within the poldiff_range_t object).  This involves two things:
+ * changes in the expanded levels, and changes to minimum category
+ * sets.  If differences are found then the range's levels vector will
+ * be filled with those differences.
+ *
+ * @param diff Diff object containing policies.
+ * @param range Range object to diff.
+ *
+ * @return Greater than zero if a diff was found, zero if none found,
+ * less than zero for errors.
+ */
+	int range_deep_diff(poldiff_t * diff, poldiff_range_t * range);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif				       /* POLDIFF_RANGE_INTERNAL_H */