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+/*
+  Copyright 2011-2020 David Robillard <d@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 <stdint.h>
+
+struct SerdModelImpl {
+  SerdWorld*     world;       ///< World this model is a part of
+  ZixBTree*      indices[12]; ///< Trees of SordQuad
+  SerdIter*      end;         ///< End iterator (always the same)
+  uint64_t       version;     ///< Version incremented on every change
+  SerdModelFlags flags;       ///< Active indices and features
+};
+
+SerdStatus
+serd_model_add_internal(SerdModel*        model,
+                        const SerdCursor* cursor,
+                        const SerdNode*   s,
+                        const SerdNode*   p,
+                        const SerdNode*   o,
+                        const SerdNode*   g);
+
+#endif // SERD_MODEL_H