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diff --git a/libapol/include/apol/isid-query.h b/libapol/include/apol/isid-query.h
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+++ b/libapol/include/apol/isid-query.h
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+/**
+ *  @file
+ *  Public Interface for querying initial SIDs of a policy.
+ *
+ *  @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 APOL_ISID_QUERY_H
+#define APOL_ISID_QUERY_H
+
+#ifdef	__cplusplus
+extern "C"
+{
+#endif
+
+#include "policy.h"
+#include "vector.h"
+#include "context-query.h"
+#include <qpol/policy.h>
+
+	typedef struct apol_isid_query apol_isid_query_t;
+
+/******************** isid queries ********************/
+
+/**
+ * Execute a query against all initial SIDs within the policy.	The
+ * returned isids will be unordered.
+ *
+ * @param p Policy within which to look up initial SIDs.
+ * @param i Structure containing parameters for query.	If this is
+ * NULL then return all isids.
+ * @param v Reference to a vector of qpol_isid_t.  The vector will be
+ * allocated by this function.  The caller must call
+ * apol_vector_destroy() afterwards.  This will be set to NULL upon no
+ * results or upon error.
+ *
+ * @return 0 on success (including none found), negative on error.
+ */
+	extern int apol_isid_get_by_query(const apol_policy_t * p, const apol_isid_query_t * i, apol_vector_t ** v);
+
+/**
+ * Allocate and return a new isid query structure. All fields are
+ * initialized, such that running this blank query results in
+ * returning all initial SIDs within the policy.  The caller must call
+ * apol_isid_query_destroy() upon the return value afterwards.
+ *
+ * @return An initialized isid query structure, or NULL upon error.
+ */
+	extern apol_isid_query_t *apol_isid_query_create(void);
+
+/**
+ * Deallocate all memory associated with the referenced isid query,
+ * and then set it to NULL.  This function does nothing if the query
+ * is already NULL.
+ *
+ * @param i Reference to an isid query structure to destroy.
+ */
+	extern void apol_isid_query_destroy(apol_isid_query_t ** i);
+
+/**
+ * Set an isid query to return only initial SIDs with this name.
+ *
+ * @param p Policy handler, to report errors.
+ * @param i isid query to set.
+ * @param name Limit query to only initial SIDs with this name, or
+ * NULL to unset this field.
+ *
+ * @return 0 on success, negative on error.
+ */
+	extern int apol_isid_query_set_name(const apol_policy_t * p, apol_isid_query_t * i, const char *name);
+
+/**
+ * Set an isid query to return only initial SIDs matching a context.
+ * This function takes ownership of the context, such that the caller
+ * must not modify nor destroy it afterwards.
+ *
+ * @param p Policy handler, to report errors.
+ * @param i isid query to set.
+ * @param context Limit query to only initial SIDs matching this
+ * context, or NULL to unset this field.
+ * @param range_match Specifies how to match the MLS range within the
+ * context.  This must be one of APOL_QUERY_SUB, APOL_QUERY_SUPER, or
+ * APOL_QUERY_EXACT.  This parameter is ignored if context is NULL.
+ *
+ * @return Always returns 0.
+ */
+	extern int apol_isid_query_set_context(const apol_policy_t * p,
+					       apol_isid_query_t * i, apol_context_t * context, unsigned int range_match);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif				       /* APOL_ISID_QUERY_H */