[xml] Cancelling xsltApplyStylesheetUser()

[Brent Smith <gnome nextreality net>]

Hi,

   Shaun McCance and myself have been looking at ways to cancel a long 
running xsltApplyStylesheet() call.  We want it to be possible for the 
user to cancel an operation if it is taking too long in Yelp[1] (GNOME's 
help browser).

Shaun has found that setting the xsltTransformContext->state = 
XML_STATE_STOPPED in the extension element function, the 
xsltApplyStylesheet() call then returns immediately (after the ext. 
element function returns).

My question is, if we cancel the process in this way, is the 
transformContext and result document in a consistent state where we can 
just call xsltFreeTransformContext() and xmlFreeDoc() and not leak large 
amounts of memory?

[1] We are investigating making the DocBook stylesheets work on a single 
"chunk" instead of processing the whole DocBook file in one go, but in 
the meantime are investigating stopping the xsltApplyStylesheet() call.

Thanks,

--
Brent Smith <gnome nextreality net>
IRC: smitten