Re: Ancestors and siblings
Jan Hidders <[email protected]>
| Newsgroups | gmane.comp.web.query-languages |
|---|---|
| Message-ID | <[email protected]> |
Donald Spaeth wrote:
>I've just been reviewing the proofs of an article I wrote last year on the
>use of XML to represent data derived from historical sources, and I realize
>that a passage on the many and wondrous uses of axes has been rendered
>obsolete by XPath 2.0 and XQuery. Can someone explain why the ancestor,
>preceding-sibling, and following-sibling axes have been dropped?
>
>
Actually, they have been put back in again, ... sort of. See the full
axis feature:
http://www.w3.org/TR/xquery/#id-full-axis-feature
If I recall correctly the two most important arguments against them were
there these axes are hard to type and hard to optimize. Personally I
find the second argument rather odd and I know that in some cases
certain optimizations become in fact more difficult if you don't have
these axes.
-- Jan Hidders
--
.-----------.-----------------------------------------------------.
/ Jan Hidders \ Home Page: http://www.win.ua.ac.be/~hidders/ \
.---------------.-----------------------------------------------------.
| Post-doctoral researcher e-mail: [email protected] |
| Dept. Math. & Computer Science tel: (+32) 3 265 38 73 |
| University of Antwerp fax: (+32) 3 265 37 77 |
| Middelheimlaan 1, BE-2020 Antwerpen, BELGIUM room: G 3.21 |
`---------------------------------------------------------------------'