Re: Template recursion, StackOverflowError, saxon:while a nd variable assignability

Dimitre Novatchev wrote:

Even in these cases it would probably be a good idea to use extension
functions and not to pollute the XSLT language itself.
  

Is it possible to use an extension function as a writable variable? If it is possible and that doesn't pollute the language, wouldn't that pollute the intent of 'no side-effects'? In my application, the side-effects are the cause of the majority of bugs although I don't see how to avoid side-effects in a transactional application.

Roger Kovack

Cheers,
Dimitre Novatchev. 

On 6/16/05, Andre Cusson <ac-ncSKzJSyWVNl57MIdRCFDg@xxxxxxxxxxxxxxxx> wrote:
  

Hi,

For assign, I have a few use cases but they are quite intricate.

I could try to extract their essence and return with more info but is this
forum the right place for this?

Just from memory I would say that typically they are global accumulators
that maintain some form of changing status maintained and shared by
multiple processes, and changing over time, in real-time, for example,
real-time streaming security analysis, in parallel processing pipelines,
over graphs of potentially billions of nodes (that you would not want to
copy over too often, especially on-line), 24/7, with a large number of
users (ex: 120 000 000/week).

We tried other methods but had to resort to assign in some cases. Finding
an alternative could involve some language redesign or changes that may not
be as simple as supporting assign.

Maybe these problems are not for XSLT but that would be quite unfortunate
because it is a fascinating language for heavy graph processing in an
on-line environment.

In any case, we would be happy if a more elegant, yet efficient alternative
can be introduced, but quickly before applications are widely sold and
installed !

How should we do this ?

Thank you
Andre



At 05:51 2005-06-15, you wrote:
    

Hi Michael, Andre

      

I understand your issues but there are a few cases that
cannot be resolved without saxon:assign and just as much as
we try to avoid it with everything we can, sometimes there
are just no reasonable alternatives. ...
        

...
      

In fact, there is still a very limited set of indispensable
saxon extensions that should be added to the standard and the
2 main ones are eval/evaluate and assign/assignable.
        

eval seems a very plausible addition to the lanaguage.

assign absolutely is not. Perhaps it's worth trying to classify
the problems that assign is solving so that a reasonable alternative
can be formulated.

The one problem I have been tempted to use assign for was to
cache a friendly unique identifier into a newly created node. This
could be resolved by introducing some form of constructor.

        Regards

                Ed Willink


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