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Subject: More thoughts on contexts (was RE: [ws-caf] Agenda for the demo application)


Hi Jim,

Timeouts: it all depends what the timeout means. The hard part is the
interpretation, and I think that must be known to the specific
processor, not to the general contexts processor. So once again, we seem
to end up employing a servant to open the door, when we are perfectly
able-bodied.

A standard model for hierarchical contexts is more interesting. One
question I have is: how easily can I construct disjoint hierarchies?
Let's say that the interposition concept is useful for transactions, but
we want a flat security domain. I'm not sure what that would mean in
practical processing terms either (carried together in a contexts
wrapper? Separately?).

Related question: in WS-TXM there is heavy emphasis on interposition,
which is an example of hierarchical context. However, I cannot discern
from the specs how the WS-CTX hierarchy is used to help this.
Specifically, the WS-TXM protocols appear to defer to WS-CF for
interpositon, but WS-CF does not seem to mandate any defined
relationship between a Coordination Service and an ALS -- which seems to
be the point of contact with WS-CTX as it currently stands.

Alastair

-----Original Message-----
From: Jim Webber [mailto:Jim.Webber@newcastle.ac.uk] 
Sent: 15 February 2004 23:55
To: Green, Alastair J.; ws-caf@lists.oasis-open.org
Subject: RE: [ws-caf] Agenda for the demo application

Hey Alastair,

[ker-snip]

I think the WS-Context context structure gives you (at least) two wins
over "ad-hoc" XML in your header blocks.

i) There's a bunch of standard stuff like timeouts which is useful.
ii) It gives you access to a standard model for hierarchical contexts
which is also useful.

Jim


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