Doc-es: various updates.

[lilypond.git] / ly / spanners-init.ly

diff --git a/ly/spanners-init.ly b/ly/spanners-init.ly
index 756a55579e377935ab3b7242db358a54eb499576..8d8a69444f8815af37d8080a75fdcf6a9a34688c 100644 (file)
--- a/ly/spanners-init.ly
+++ b/ly/spanners-init.ly
@@ -1,18 +1,15 @@
 \version "2.19.29"
 
 "\\=" =
-#(define-event-function (id event) (number-or-string? ly:event?)
+#(define-event-function (id event) (key? ly:event?)
   (_i "This sets the @code{spanner-id} property of the following
-@var{event} to the given @var{id} (numbers will be converted to a
-string).  This can be used to tell LilyPond how to connect overlapping
+@var{event} to the given @var{id} (non-negative integer or symbol).
+This can be used to tell LilyPond how to connect overlapping
 or parallel slurs or phrasing slurs within a single @code{Voice}.
 @lilypond[quote,verbatim]
 \\fixed c' { c\\=1( d\\=2( e\\=1) f\\=2) }
 @end lilypond\n")
-  (set! (ly:music-property event 'spanner-id)
-       (if (number? id)
-           (number->string id)
-           id))
+  (set! (ly:music-property event 'spanner-id) id)
   event)
 
 startGroup = #(make-span-event 'NoteGroupingEvent START)