Timothy S. Nelson wrote:
>       Hi all.  I've enjoyed(?) reading over the February/March thread 
> entitled "Musings on operator overloading".  I've brought a few thoughts 
> along; if they're old news, please tell me where to do more reading on it :).
>       Over the last year or two, I've discovered XPath.  I've always thought 
> XML a little annoying, but I'm very impressed with XPath (which I regard as 
> "the glob() of XML"), and I've been wondering how to get the power of XPath 
> in 
> relation to *all* data, not just XML.

Sometimes I wish for something similar. Perl 5's Data::Diver goes a bit
in that direction, but it's not nearly as flexible as XPath.

>       My eventual thought was that what would be useful is a role called 
> Plex (for those who aren't familiar with a Plex, just think "Tree" and you'll 
> have the right idea).  The basic idea is that the Plex role could have a 
> variety of implementors depending on the data desired (much like the DBI/DBD 
> split, but for trees instead of tables).  The backends could of course 
> include 
> filesystems, but also XML, LDAP, OO databases, and DNS domains.
>       Tabular data could also be mapped into trees if desired.  This could 
> be anything from SQL to text files.
>       As an additional idea, backend conversion could be performed.  This 
> would be especially useful in the case of files.  For example:
> $root/etc/fstab <convert to text table> / "/boot"
>       ...which would select the row from fstab that contains the "/boot" 
> partition; admittedly I've fudged the conversion here.

It sounds like a perfect idea for a very general library or rather
library framework. Perl 6 has all the hooks to install stuff like this.

>       Btw, it was quite a long time before I was able to find the operator 
> overloading documentation; "Subroutines" was not an intuitive place to look

When you know that operators are mostly[1] just weirdly named subs, it
is ;-)

> :).  Is there any chance we could add something to S03 that says something 
> like "see S06 and S13 for operator overloading"?

That would be mainly Larry's decision.
Other ways to search in the Synopsis are
 * check out a copy of the svn repo, and grep/ack in them
 * ask in #perl6 where some particular item is documented

Sadly we have next to no user-level documentation at them moment. The
closest might be the open sourced version of "Perl 6 and Parrot
Essentials", but it's rather incomplete and some parts are quite out of

[1] some operators like ~~ actually have more macroish semantics

Moritz Lenz
http://perlgeek.de/ |  http://perl-6.de/ | http://sudokugarden.de/

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