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   Re: [xml-dev] Quick Xpath

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Hi Bob,

> We (at jaxen.org) have had many discussions, particular regarding
> //foo and our breadth-first walk of the tree instead of depth-first.
> We sometimes end up with nodes out-of-document-order.
> Technically, I think we're compliant, but it sure can annoy the
> user. ;)

It would certainly be annoying if, for example, (//foo)[4] didn't
return the 4th foo element in the document, because it wouldn't be

In the XPath 1.0 spec it states that a Predicate on an expression (as
here) filters the node-set with respect to the child axis [1]. The
child axis is a forward axis, so the nodes must be arranged in
document order when assessing their position [2].



[1] http://www.w3.org/TR/xpath#node-sets
[2] http://www.w3.org/TR/xpath#predicates

Jeni Tennison


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