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diff --git a/src/sord_internal.h b/src/sord_internal.h
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+/*
+  Copyright 2011-2015 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 SORD_SORD_INTERNAL_H
+#define SORD_SORD_INTERNAL_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "sord/sord.h"
+
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
+#    define SORD_UNREACHABLE() __builtin_unreachable()
+#else
+#    define SORD_UNREACHABLE() assert(false)
+#endif
+
+/** Resource node metadata */
+typedef struct {
+	size_t refs_as_obj;  ///< References as a quad object
+} SordResourceMetadata;
+
+/** Literal node metadata */
+typedef struct {
+	SordNode* datatype;  ///< Optional literal data type URI
+	char      lang[16];  ///< Optional language tag
+} SordLiteralMetadata;
+
+/** Node */
+struct SordNodeImpl {
+	SerdNode node;  ///< Serd node
+	size_t   refs;  ///< Reference count (# of containing quads)
+	union {
+		SordResourceMetadata res;
+		SordLiteralMetadata  lit;
+	} meta;
+};
+
+#endif /* SORD_SORD_INTERNAL_H */