Re: Where can I find reasonable definitions of ''Identity predicates'(?) that we use in our own .scm files?

[Ian Hulin]

Hi James,

Try
http://www.gnu.org/software/guile/manual/html_node/About-Data.html#About-Data

Cheers,
Ian

On 17/12/11 22:18, James wrote:
> Hello,
> 
> As part of a tracker issue and for my own education I'm trying to 
> understand the 'types' (if that is the correct term - from
> Wikipedia of Scheme I'm wondering of they are 'Identity
> predicates') of the variables (again if that is the correct term)
> in the listings in some of the scm files.
> 
> For example in the printed IR I might see:
> 
> --snip-- figuredBassAlterationDirection (direction) Where to put
> alterations relative to the main figure.
> 
> figuredBassFormatter (procedure) A routine generating a markup for
> a bass figure.
> 
> ignoreFiguredBassRest (boolean) Don�t swallow rest events.
> 
> implicitBassFigures (list) A list of bass figures that are not
> printed as numbers, but only as --snip--
> 
> What I am interested in are the different 'types' ((list),
> (boolean), (procedure), (direction) and so on) and what they mean
> in a scm context so I can assign correct text strings for
> documentation. So if I had a Property of ABC and I wanted to use a
> True or False or maybe a single integer and so on, which would be
> the correct 'type' to list.
> 
> I'm not asking for specific answers in as much as pointer to a scm 
> website perhaps or some online doc that I could look at and glean.
> 
> I'm trying to create a new scm/paper-properties.scm type-file to
> help move forward
> 'http://code.google.com/p/lilypond/issues/detail?id=1392', I am
> well out of my comfort/knowledge zone I realise, but am hoping to 
> get an idea of how the whole autogenerated doc process for things
> like Appendixes and the IR work by 'having a go'.
>