This is already supported in Saxon-JS:
http://www.saxonica.com/saxon-js/documentation/index.html#!ixsl-extension/instructions/schedule-action
But I'm not sure how this concept would fit into "normal" XSLT processing.
One can certainly see that the idea of sending off multiple HTTP requests and
processing each result as soon as it arrives would be equally applicable to
server-side processing, but some might see this as something best done in the
"framework" that controls and despatches XSLT transformations, rather than in
the stylesheeet itself.
Michael Kay
Saxonica
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