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RE: mapping (Was: Re: Re: . in for)

Subject: RE: mapping (Was: Re: Re: . in for)
From: DPawson@xxxxxxxxxxx
Date: Wed, 9 Jan 2002 11:10:58 -0000
RE: mapping (Was: Re:  Re: . in for)
Hi Jeni.
> > +1 on mapping, but I dislike the above syntax Jeni.
> > Scheme gives (map fn sequence).
> >
> > How about 
> >
> > select='map lower-case(.) $departments'/>
> > or
> > select='map (lower-case(.) $departments)'/>
> >
> > or does this go against the idea of extending keywords?
> Well, neither follows the pattern of other operators/keywords in the
> XPath 2.0 WD (in particular the second will get confusing because it
> looks like a function but without a comma between the arguments) 

Yes, I suppose to follow a standard function form it should be

select ='map (lower-case(), $departments)'.
(Accepting Dimitre's comment too).

> but this organisation doesn't make it particularly easy to pipe
> functions together (or at least not in a similar way to location
> paths).

I'm sure David C or Dimitre could extend this to a piped form?
  select='map (fnA(), (map (fnb(), $departments)))'

which maps function A over the result set of mapping function b
over $departments?

Like this more and more!

 Using the example:
>   $coordinates -> (. * 2)
>                -> if (position() mod 2) then . + 50 else .
> I think that the above syntax would be:
>   map (if (position() mod 2) then . + 50 else .) over
>   map (. * 2) over $departments

How about map (plus50-if-odd(), .)

then the function would check for position and do the 
adding 50 if applicable?

> If you want keywords, we could keep the for expression, just drop the
> range variable, so that you had:
>   for $departments return lower-case(.)

Having got used to xml syntax, the for in the xpath bit
strikes me as really out of place, I don't like it at all.
IMHO it should be brought back into xml syntax.

Regards DaveP

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