Dear Travis,
it always depends on the XQuery implementation, and its optimizer,
which query variant will be evaluated more efficiently. In BaseX, your
two example queries...
for $x in doc('test')/* where $x/node="value" return $x
for $x in doc('test')/*[node="value"] return $x...will both be simplified/rewritten to this query:
doc('test')/*[node="value"]
The "Query Info" panel in BaseX will give you more insight on how your
queries are compiled and optimized.
Hope this helps,
Christian
___________________________
On Sun, Jan 31, 2010 at 10:57 PM, Travis Webb <tjwebb@vt.edu> wrote:
> I'm trying to figure out which is more efficient (xpath or xquery select),
> so if someone has knowledge on this I'd appreciate any input. This may or
> may not be specific to the implementation of BaseX.
> For example, the following queries return the same thing, but which one is
> faster? Does basex treat them the same way? 1 uses xquery select, 2 uses
> xpath
> 1. for $x in doc('test')/* where $x/node="value" return $x
> OR
> 2. for $x in doc('test')/*[node="value"] return $x
> Thanks.
> -tjw
Christian Gruen
Universitaet Konstanz
Department of Computer & Information Science
D-78457 Konstanz, Germany
Tel: +49 (0)7531/88-4449, Fax: +49 (0)7531/88-3577
http://www.inf.uni-konstanz.de/~gruen