[xquery-talk] General comparisons of speed of xquery vs. xslt
danielaf at bea.com
Wed Apr 28 12:15:55 PDT 2004
> (b) with in-memory transformations there is no intrinsic reason why
> should be faster than XSLT
I think I disagree with this statement. This might be due to the fact
I understand XQuery much better then I do understand XSLT, but here is
my rationale anyway.
Most XQuery code rewriting rules that we apply in the BEA
serious dataflow analysis (i.e. how is the data flowing through
expressions, where is the
data coming from and where is it going), similar in spirit with the way
all modern compilers do.
Trivial examples of code rewriting rules that require dataflow analysis
eliminating the unnecessary sorts and duplicate elimination,
navigation into forward navigation, introducing parallelism and
asyncronicity, etc, but there
are many, many others.
Moreover, we are building a streaming XQuery engine. Of course, not all
queries can be
executed in a purely streaming fashion. We use the same dataflow
detect and minimize the need for materialization, which is essential
for query performance.
Now it seems to me that this dataflow analysis is easier to do in
XQuery (through expressions)
then in XSLT (through templates). Knowing XSLT much better then I do,
what is your take on this?
Are there any XSLT implementations that do dataflow analysis for
P.S. A while ago we wrote a paper describing our streaming XQuery
• Daniela Florescu, Chris Hillery, Donald Kossmann, Paul Lucas, Fabio
Riccardi, Till Westmann, Michael J. Carey, Arvind Sundararajan, Geetika
The BEA/XQRL Streaming XQuery Processor. VLDB 2003: 997-1008
A better version will appear in VLDB Journal soon.
And by the way, in this paper we did compare our XQuery implementation
with an XSLT implementation.
While doing so, we did translate XMark in XQuery. If there is some
demand, we can spend some time,
polish those queries and publish them in an open forum somewhere.
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