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+/*
+  Copyright 2011-2018 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef SERD_MODEL_H
+#define SERD_MODEL_H
+
+#include "serd/serd.h"
+#include "zix/btree.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define SERD_NUM_ORDERS 12
+
+struct SerdModelImpl {
+	SerdWorld* world;
+
+	/** Index for each possible triple ordering (may or may not exist).
+	 * Each index is a tree of SordQuad with the appropriate ordering.
+	 */
+	ZixBTree* indices[SERD_NUM_ORDERS];
+
+	uint64_t version;
+};
+
+#endif  // SERD_MODEL_H