At 2010-08-06 16:53 +0100, Dave Pawson wrote:
On Fri, 06 Aug 2010 16:37:09 +0100
David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> wrote:
> On 06/08/2010 12:31, Dave Pawson wrote:
> > If implementations did what the casual reader might assume
> > I wouldn't have to Andrew?
> > The spec, read today, with xml:id existent, is misleading.
> xml:id isn't related to generate-id is it?
It is the 'todays' version of id, as used in XML.
Hence in my view generate-id() function should generate an id value
as defined in XML rec.
so yes, in my view, it is related David.
I don't follow your argument, Dave. An input document's identifiers
have *no* relationship to generate-id().
Consider this: if your reasoning that generate-id() must produce a
value set exclusive of the xml:id values to ensure that id values in
the output are unique, this falls apart when you consider that the
aggregation of two documents where each are independently (and
validly) using the same value for xml:id=. The processor cannot
automatically disambiguate them in the aggregation because that would
However, if you follow my rule of thumb that *every* xml:id= or id=
or ID-typed attribute named prod= (for example) is translated to
output using the generate-id() for that node ... and every reference
to those identifiers is replaced with the generated identifier for
the referenced node, then the references will be both preserved and
unambiguous in the result.
As to the earlier comment contributed regarding pointers from outside
of the document to inside the document, in an aggregation where ids
are not unique across the input set there would still be a problem of
ambiguity even if the ids are not translated.
Therefore, generate-id() is necessarily independent of any knowledge
of any content. It is a model implementation concept and not a data
concept. In the classroom I teach this concept in the same
discussion as the XPath data model, and the function is later on
described as the exposition of this aspect of the implemented data
model. This helps students understand that generate-id() is exposing
a single value that has been generated for a given node, not actively
generating new identifiers each time it is called for a given node in
a single transformation.
I hope this is considered helpful.
. . . . . . . . . . Ken
XSLT/XQuery training: after http://XMLPrague.cz 2011-03-28/04-01
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