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> XPath comes up here and came up in several of the other responses. Perhaps
> someone could answer what class of XPaths, if known prior to document parse,
> can not be satisfied during the document parsing?
Here's a shot at which ones can, from the STX (Streaming
Transformations for XML) spec.
There's a few more things that STX processors will allow, for example
to access the first text child of a node when the node is encountered
as an event, that's convenient (requires a time delay of one event
when reporting events).
I'm sure the folks on the STX mailing list would happily discuss their
extensive experience with event matching, they've been implementing it
for over a year..