writing identifiers

[madhg]

I'd like to have an identifier to represent "\once \override Slur
#'transparent = ##t \appoggiatura" 
(nearly the same as \grace, but with better spacing when the gracenote is a
quarter-note).

I tried to model it on:

     padText =
     #(define-music-function (parser location padding) (number?)
       #{
         \once \override TextScript #'padding = #$padding
       #})

from the "Learning Manual" section of the documentation:
http://lilypond.org/doc/v2.11/Documentation/user/lilypond/Saving-typing-with-identifiers-and-functions

But after rereading this section of the doc, I still don't know what should
go after "parser location" or replace "(number?)".  Is that information
somewhere accessible (bearing in mind that the Learning Manual is intended
for non-experts)?  I feel rather at sea here.

David
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