You could make a call with the document function (in a non-functional
way :) ) to a back end that uses a custom uri resolver that, when
receives a certain href, logs/writes the /real/ current-dateTime and
returns <nothing/>.
On Fri, 2008-04-18 at 10:24 -0400, Liam Quin wrote:
On Fri, Apr 18, 2008 at 02:05:52PM +0100, Andrew Welch wrote:
It should be straightforward to write an extension function instead...
Actually no. A conformant implementation is allowed to call an
extension function only once for any given argument value, and
to remember the results, to make it stable. A give implementation
might let you write such an extension function as you want, but
there's no guarantee.
In addition, suppose you have a stylesheet that does, say
xsl:for-each 1 to 1000
value-of current-time
the implementation doesn't have to start at 1 and evaluate the
"loop" a thousand times. Instead, this could be written as,
map the items in the sequence (1 ... 1000)
to the value of current-time
with current-time being called once.
Or, the implementation could start at 1000 and work downwards,
and as long as it ended at 1 and put the results in the right
order, you coudn't tell.
And yes, there are implementations that do that sort of thing :-)
at least for XQuery and quite possibly for XSLT.
So, best to think of XSLT as specifying a mapping, rather than
in terms of procedural instructions.
Hppe this helps, although it's perhaps notwhat you want to hear.
Best,
Liam
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