On Sun, 2008-01-27 at 07:52 -0800, Steven Ericsson-Zenith wrote:
I have read the spec but I am obviously not as familiar with it as
those that specified it. I admit, I am more comfortable with certain
other well-known terminology.
I do - at least I think I do - understand the implementation, I am
just expressing a discomfort with the counter intuitive nature of the
third parameter in key.
I think it is strange in Lisp/Scheme to do:
(* 2 3)
to multiply 2 and 3, when from grade school I was taught to do 2 * 3
but if I want to write in that language, that is what I have to do.
It is what it is.
With respect,
Steven
On Jan 27, 2008, at 2:18 AM, Michael Kay wrote:
My primary concern, in this case, relates to the scope of
keys. If a key name is specified in a style sheet as some
global name, I am a little concerned that the name is context
sensitive.
Have you read the specification? I suspect you wouldn't be using the
word
"key" like that if you had.
A key definition is a set of xsl:key declarations sharing the same
name. Key
definitions are global, and they are not context sensitive.
The effect of the key() function with three arguments key(N, V, R)
is to
select all nodes that match the match pattern of one of the key
declarations
in the key definition named N, that are descendants-or-self of R,
where the
result of evaluating the use expression of the key declaration, with
N as
the context node, returns a sequence containing an item that is
equal to one
of the items in V.
The effect of key() with two arguments key(N, V) is the same as
key(N, V,
(/)). That is, the third argument defaults to "/", which returns the
root of
the tree containing the context node. That is context sensitive, by
virtue
of the definition of "/".
Michael Kay
http://www.saxonica.com/
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