(doc help) 11.2, incomprehensible language

[Graham Percival]

11.2 Markup programmer interface

Markups are implemented as special Scheme functions. When applied with 
as arguments an output definition (\layout or \paper), and a list of 
properties and other arguments, produce a Stencil object.

    * Markup construction in Scheme
    * How markups work internally
    * Markup command definition
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I have no idea what the second sentence is trying to say.  Can I simply 
delete it?
- Graham