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In a markup like
\raise #0.5 "foo"
\raise is actually represented by the raise-markup
function. The markup expression is stored as
(list raise-markup 0.5 (list simple-markup "foo"))
When the markup is converted to printable objects (Stencils), the
raise-markup function is called as
(apply raise-markup
\layout object
list of property alists
0.5
the "foo" markup)
The raise-markup function first creates the stencil for the
foo string, and then it raises that Stencil by 0.5 staff space.
This is a rather simple example; more complex examples are in the rest
of this section, and in scm/define-markup-commands.scm.
This page is for LilyPond-2.8.8 (stable-branch).