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diff --git a/slv2/value.h b/slv2/value.h
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+/* SLV2
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ *  
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 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 General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef __SLV2_VALUE_H__
+#define __SLV2_VALUE_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <slv2/types.h>
+
+/** \addtogroup data
+ * @{
+ */
+
+
+/** Return whether two values are equivalent.
+ */
+bool
+slv2_value_equals(SLV2Value value, SLV2Value other);
+
+
+/** Return whether the value is a URI (resource).
+ *
+ * Time = O(1)
+ */
+bool
+slv2_value_is_uri(SLV2Value value);
+
+
+/** Return this value as a URI string, e.g. "http://example.org/foo".
+ * 
+ * Valid to call only if slv2_value_is_uri(\a value) returns true.
+ * Returned value is owned by \a value and must not be freed by caller.
+ * 
+ * Time = O(1)
+ */
+const char*
+slv2_value_as_uri(SLV2Value value);
+
+
+/** Return whether this value is a literal (i.e. not a URI).
+ *
+ * Returns true if \a value is a string or numeric value.
+ *
+ * Time = O(1)
+ */
+bool
+slv2_value_is_literal(SLV2Value value);
+
+
+/** Return whether this value is a string literal.
+ *
+ * Returns true if \a value is a string (but not  numeric) value.
+ *
+ * Time = O(1)
+ */
+bool
+slv2_value_is_string(SLV2Value value);
+
+
+/** Return whether this value is a string literal.
+ *
+ * Time = O(1)
+ */
+const char*
+slv2_value_as_string(SLV2Value value);
+
+
+/** Return whether this value is a decimal literal.
+ *
+ * Time = O(1)
+ */
+bool
+slv2_value_is_float(SLV2Value value);
+
+
+/** Return \a value as a float.
+ * 
+ * Valid to call only if slv2_value_is_float(\a value) or
+ * slv2_value_is_int(\a value) returns true.
+ *
+ * Time = O(1)
+ */
+float
+slv2_value_as_float(SLV2Value value);
+
+
+/** Return whether this value is an integer literal.
+ * 
+ * Time = O(1)
+ */
+bool
+slv2_value_is_int(SLV2Value value);
+
+
+/** Return \a value as an integer.
+ * 
+ * Valid to call only if slv2_value_is_int(\a value) returns true.
+ *
+ * Time = O(1)
+ */
+int
+slv2_value_as_int(SLV2Value value);
+
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SLV2_VALUE_H__ */