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Re: Regular expression functions (Was: Re: comments on

Subject: Re: Regular expression functions (Was: Re: comments on December F&O draft)
From: naha@xxxxxxxxxx
Date: Fri, 11 Jan 2002 13:03:41 -0500 (EST)
regular expression coordinates
Quoting Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>:
> Is that because constructing *nodes* is expensive or is it the *links*
> between the nodes within a tree that makes things problematic? If the
> latter, then perhaps documentless nodes are a blessing ;) If the
> former, then it's a good argument for nested sequences, so you don't
> have to create nodes to provide structure.
> For example, given the problems that I described about processing x,y
> coordinates as pairs, there's a strong temptation to create pairs of
> coordinates as 'coordinate' elements with 'x' and 'y' attributes,
> rather than a simple sequence of integers. If sequences could be
> nested, I wouldn't feel that temptation.

I expect that in order to allow for nested sequences of <things>, the
data model would have to be extended to allow <things> to be first
class.  As it stands now, how would it know whether when putting togenter
(to use lisp notation) the sequences

    (a b) and (c d)

you meant to get

    (a b c d)


    ((a b) (c d))

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