Re: [Technical Errata Reported] RFC5261 (3477)

* RFC Errata System wrote:
>Original Text
>-------------
>In XPath 2.0, a "bar" selector
>not only matches an unqualified <bar> element, but also matches a
>qualified <bar> element that is in scope of a default namespace
>declaration.  In contrast, in this specification, a selector without
>a prefix only matches one element, and it may match an element with
>or without a prefix but only if the namespace it's qualified with (or
>none) is an exact match.

>Notes
>-----
>The original text is not easy to understand, but seems to assume that
>an unprefixed name in XPath 2.0 matches both unprefixed names, and =

>prefixed ones that have the same namespace than the default namespace of =

>the XPath static context. This is not the case: Matching depends on how =

>the "default element/type namespace" of the XPath static context is =

>defined, and then matches either namespace-less elements, or those in =

>the "default element/type namespace", but never both. This context, =

>however, is defined by the XPath itself, not by the document. Thus, it =

>can be set externally and could be set to the diff document's default =

>namespace (if there is one). In that case, XPath 2.0 can be used to =

>evaluate XML Patch selectors.

Indeed, see <http://www.w3.org/TR/xpath20/#node-tests>, 3rd paragraph.

(I do note that this is not the only difference between XPath 1.0 and
XPath 2.0, so the conclusion that then XPath 2.0 can be used to evalu-
ate XML Patch selectors is not necessarily correct, especially if it
cannot be assumed that defaults like "Default element/type namespace"
cannot be assumed to be chosen to maximise compatibility. But that is
out of scope of the Original Text this item is concerned with.)
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