[racket] sxpath, txpath and accessors

I have not been able to get those axes working either. I've looked
briefly at the implementation of `sxml:preceding`, and it's unclear to
me how it could even work.

Since `txpath` appears to work, I'd stick with that. I'm not sure why
it's deprecated in favor of `sxpath`. Since, AFAICT, we're just
packaging that library (i.e. not developing it) and its development
appears to have stopped, I don't expect `txpath` to go anywhere.

Vincent



At Tue, 3 Mar 2015 06:56:34 -0500,
Sanjeev K Sharma wrote:
> 
> On Mon, Mar 02, 2015 at 09:52:53AM -0500, Vincent St-Amour wrote:
> > I recommend the short tutorial near the top of this document:
> > 
> >     http://pkg-build.racket-lang.org/doc/sxml/sxpath.html
> >
> 
> Thanks for the suggested solution;
> 
> that was exactly the document I referred to 
> 
> I have not been able to generate an sxpath working example of the axes listed at the bottom of that page.  Aside from generating an example, from Oleg's documents to some other google hits I haven't found working examples either.
> 
> a simplified example (including your suggestion)
> 
> #lang racket (require sxml)(require sxml/html)
> (define doc(html->xexp
> "<AAA>
>    <BBB>
>       <CCC/>
>       <www> www content <xxx/><www>
>       <zzz/>
>    </BBB>
>    <XXX>
>       <DDD> content in ccc 
>       </DDD>
>    </XXX>
> </AAA>"))
> 
> ((txpath"/aaa/xxx/preceding::ccc")doc)
> ;  '((ccc))
> 
> 
> ((txpath"/aaa/xxx/preceding::www")doc)
> ;  '((www "\n" "      " (zzz) "\n" "   ")
> ;    (www
> ;     " www content "
> ;     (xxx)
> ;     (www "\n" "      " (zzz) "\n" "   ")))
> ;  '()
> 
> ((sxpath '(aaa xxx (sxml:preceding '(www)))) doc)
> ;  '()
>   
> ((sxpath '(aaa xxx (sxml:preceding (www)))) doc)
> ;  '()
> 
> ((sxpath'(aaa xxx (preceding:"www")))doc)
> ;  '()
> 
> ((sxpath '(aaa xxx ((sxml::preceding "www")))) doc)
> ;  '()
> 
> ((sxml:preceding ((sxpath '(aaa xxx www))))doc)
> ;  '()
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