[plt-scheme] Re: getting data out of xexpr's (xml)

Ah-ha! - you meant xml-match inside Webit!?

S.


On Jan 8, 2008 2:50 PM, Stephen De Gabrielle <stephen at degabrielle.name>
wrote:

> Yeah, thanks for raising that.
>
> I think I've seen this in the test cases; I think order-independent list
> pattern in plt-match is
>     (list-no-order pat ... lvp)       Match arguments in a list in any
> order
> , but I haven't tried it yet.
>
> I'm using Matt's example as a base at the moment, and just hoping my data
> is ordered consistently, not because the schema/dtd requires it, but because
> it is machine generated. (probably too much of an assumption)
>
> By xml-match so you mean sxml-match? if not please tell me, as I have
> missed it.
>
> Both sxml-match and SXPath seem to cover all the bases, but I am trying
> them one at a time.
>
> Cheers,
>
> Stephen
>
>
> On Jan 8, 2008 2:22 PM, Dave Gurnell <d.j.gurnell at gmail.com> wrote:
>
> > My two cents on XML matching:
> >
> > I tend to find match and plt-match to be a little restrictive for XML
> > pattern matching. The classic example of this is attributes on elements,
> > which can arrive in any order. For example:
> >     '(a (@ [href "http://www.example.com"]
> >            [target "_new"])
> >         "Example web site")
> >
> > is equivalent to:
> >
> >     '(a (@ [target "_new"]
> >            [href "http://www.example.com"])
> >         "Example web site")
> >
> > but you have to match against it with two clauses like this:
> >
> >     (match link
> >       [`(a (@ [target ,target] [href ,href]) ,text)
> >        ...]
> >       [`(a (@ [href ,href] [target ,target]) ,text)
> >        ...])
> >
> > or using nested matches, one for the elements and one for the
> > attributes.
> >
> > Perhaps there's an order-independent list pattern in plt-match that I
> > don't know about? If not, the XML matching library is probably better for
> > this kind of thing. However, xml-match it has its own limitations too (I
> > can't remember these off the top of my head: I just remember that writing
> > delicious.plt wasn't as straightforward as I might have hoped).
> >
> > I haven't tried SXPath yet.
> >
> > Cheers,
> >
> > -- Dave
> >
> > _________________________________________________
> >  For list-related administrative tasks:
> >  http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> >
> >
>
>
> --
>
> Cheers,
>
> Stephen
>
>
>
> --
> Stephen De Gabrielle
> s.degabrielle at ucl.ac.uk
> Telephone +44 (0)20 7679 5242 (x45242)
> Mobile                  079 851 890 45
> http://www.uclic.ucl.ac.uk/annb/MaSI.html
> University College London Interaction Centre
> Remax House - 31/32 Alfred Place
> London - WC1E 7DP
>
> "There's an old story about the person who wished his computer were as
> easy to use as his telephone.  That wish has come true, since I no longer
> know how to use my telephone. " -- Bjarne Stroustrup
>



-- 
Cheers,

Stephen



--
Stephen De Gabrielle
s.degabrielle at ucl.ac.uk
Telephone +44 (0)20 7679 5242 (x45242)
Mobile                  079 851 890 45
http://www.uclic.ucl.ac.uk/annb/MaSI.html
University College London Interaction Centre
Remax House - 31/32 Alfred Place
London - WC1E 7DP

"There's an old story about the person who wished his computer were as easy
to use as his telephone.  That wish has come true, since I no longer know
how to use my telephone. " -- Bjarne Stroustrup
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/users/archive/attachments/20080108/84bf8ca3/attachment.html>