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From Donald Ball <>
Subject Re: [c2] stylesheet and logicsheet parameters
Date Sun, 15 Apr 2001 20:18:39 GMT
On Sun, 15 Apr 2001, giacomo wrote:

> The fact is that for every parameter/attribute/coockie/... you make
> available in the stylesheet you have to take that variable into account
> for the key generation steps for the cache system and thus you are
> unlikely to have pages that will cache because of too many variables to
> take into account (which likely changes your keys for every request). I
> cannot think of a page in my systems that are designed to have the need
> for variable values passed by C2 to my stylesheets.

okay, sure, that's definitely something that authors should be _aware_ of,
but i still think it's something we should allow. it's very easy for us to
tell which parameters a stylesheet depends upon if we pass in our own DOM
objects - whenever a parameter is accessed from the stylesheet, our DOM
object can record the access and when we're finished, we can query the DOM
object and find out upon what parameters the stylesheet depends.

(note i think we've still got one big problem left in our cache system -
how do xsp pages report upon which parameters they depend?)

> > there are a few categories of data that people like to access from
> > their stylesheets:
> Really? From their stylesheets? Why?

uh, to affect the transformation based on request-time data, naturally.

> > * request parameters
> > * cookie values
> > * session values
> > * http headers
> > * browser capabilities
> Don't do it, guys. You ruin the cache system if you put all that into
> the TraxTransformer.

you don't ruin it, you just make the cache bigger. but since you can find
out which parameters the stylesheet depends on by inspection, you can
limit the size of the cache.

look, the other option you could do is add the data you're interested in
to the xml page using xsp - e.g. add a cookie named 'foo' valued 'bar'
sort of like this:


and then you can access it from your xslt stylesheet that way instead of
using $cookie/foo. the two approaches are functionally identical, right?

- donald

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