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RE: Re: Assignment no, dynamic scoping si (was: Re: RE

Subject: RE: Re: Assignment no, dynamic scoping si (was: Re: RE: Wishes for XSL revisions ...
From: "Evan Lenz" <elenz@xxxxxxxxxxx>
Date: Wed, 2 Jan 2002 13:11:12 -0800
RE:  Re: Assignment no
Wendell Piez wrote:
> (And just checking ... XPath experts ...
> ancestor-or-self::*[@source][last()] will give me the *closest* 'source'
> attribute on an ancestor or self ... not the most distant, won't it?)

Unless a predicate is bound (without intervening parentheses) to a node
test, it is always evaluated with respect to a "forward" axis (the XPath
spec arbitrarily chooses the child axis).


Your example features both kinds of predicates. The first predicate is part
of the Step production (tightly bound to the node test) and the second is
part of a FilterExpr (loosely applied to the result of the expression to the
left). As it happens, the first predicate is not a positional predicate, so
the fact that it's evaluated with respect to a "reverse" axis makes no
difference to the result. The second predicate, as stated above, is
evaluated with respect to a "forward" axis, i.e. document order. So, yes,
the second predicate selects the node (from the node-set result of the
expression to the left) that's *last* in document order.


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