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diff --git a/src/symap.h b/src/symap.h
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+/*
+  Copyright 2011 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.
+*/
+
+/**
+   @file symap.h API for Symap, a basic symbol map (string interner).
+
+   Particularly useful and intended for implementation of the LV2 URI map and
+   URI unmap extensions.
+
+   @see <a href="http://lv2plug.in/ns/ext/uri-map/">LV2 URI Map</a>
+   @see <a href="http://lv2plug.in/ns/ext/uri-unmap/">LV2 URI Unmap</a>
+*/
+    
+#ifndef SYMAP_H
+#define SYMAP_H
+
+#include <stdint.h>
+
+struct SymapImpl;
+
+typedef struct SymapImpl Symap;
+
+/**
+   Create a new symbol map.
+*/
+Symap*
+symap_new();
+
+/**
+   Free a symbol map.
+*/
+void
+symap_free(Symap* map);
+
+/**
+   Map a string to a symbol ID if it is already mapped, otherwise return 0.
+*/
+uint32_t
+symap_try_map(Symap* map, const char* sym);
+
+/**
+   Map a string to a symbol ID.
+
+   Note that 0 is never a valid symbol ID.
+*/
+uint32_t
+symap_map(Symap* map, const char* sym);
+
+/**
+   Unmap a symbol ID back to a symbol, or NULL if no such ID exists.
+
+   Note that 0 is never a valid symbol ID.
+*/
+const char*
+symap_unmap(Symap* map, uint32_t id);
+
+#endif /* SYMAP_H */