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Re: XPath filters equivalence

From: Joe Kesselman <keshlam-nospam@-------.--->
To: NULL
Date: 10/6/2007 7:28:00 AM

Altu wrote:
> Is [p1][p2][p3] the same as [p1 AND p2 and p3] in XPath?

Depends on the predicate. If p2 or p3 tests position() or last(), _NO_ 
-- the latter form would test position in the original set, while the 
former would test position in the set that has gotten past the 
preceeding filter(s).

> Also if I have a predicate that starts with "/" or "//", does it
> matter where in the XPath expression it is?
> /a[/a/b]/c/d
> /a/c[/a/b]/d
> /a/c/d[/a/b]

In these examples: no, since an absolute XPath by definition ignores its 
context and since if it fails in any of these the result is that we find 
no nodes. (Though for performance reasons in typical processors, you 
will probably want to test it earlier rather than later).

In more complicated XPaths, maybe.

-- 
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