VikLoadType_t a_file_load ( VikAggregateLayer *top, VikViewport *vp, const gchar *filename );
gboolean a_file_save ( VikAggregateLayer *top, gpointer vp, const gchar *filename );
/* Only need to define VikTrack if the file type is FILE_TYPE_GPX_TRACK */
gboolean a_file_export ( VikTrwLayer *vtl, const gchar *filename, VikFileType_t file_type, VikTrack *trk, gboolean write_hidden );
VikLoadType_t a_file_load ( VikAggregateLayer *top, VikViewport *vp, const gchar *filename );
gboolean a_file_save ( VikAggregateLayer *top, gpointer vp, const gchar *filename );
/* Only need to define VikTrack if the file type is FILE_TYPE_GPX_TRACK */
gboolean a_file_export ( VikTrwLayer *vtl, const gchar *filename, VikFileType_t file_type, VikTrack *trk, gboolean write_hidden );