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diff --git a/mg_keytypes.h b/mg_keytypes.h
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+/*! \file  mg_keytypes.h
+ *  \ingroup muggle
+ *  \brief  key type definitions for all backends
+ *
+ * \version $Revision: 1.4 $
+ * \author  Wolfgang Rohdewald
+ * \author  file owner: $Author: wr61 $
+ *
+ */
+
+/* makes sure we don't use the same declarations twice */
+#ifndef _MUGGLE_KEYTYPES_H
+#define _MUGGLE_KEYTYPES_H
+
+enum mgKeyTypes {
+	keyGdGenre1=1, // the genre types must have exactly this order!
+	keyGdGenre2,
+	keyGdGenre3,
+	keyGdGenres,
+	keyGdDecade,
+	keyGdYear,
+	keyGdArtist,
+	keyGdAlbum,
+	keyGdTitle,
+	keyGdTrack,
+	keyGdLanguage,
+	keyGdRating,
+	keyGdFolder1,
+	keyGdFolder2,
+	keyGdFolder3,
+	keyGdFolder4,
+	keyGdCreated,
+	keyGdModified,
+	keyGdArtistABC,
+	keyGdTitleABC,
+	keyGdCollection,
+	keyGdCollectionItem,
+	keyGdUnique
+	// here come other backends: keyXXTitle = 50, (reserve)
+};
+const mgKeyTypes mgGdKeyTypesLow = keyGdGenre1;
+const mgKeyTypes mgGdKeyTypesHigh = keyGdUnique;
+
+enum mgSortBy {
+	mgSortNone,
+	mgSortByValue,
+	mgSortById,
+	mgSortByIdNum
+};
+
+#endif