Appeal No. 2002-1812
Application 08/861,181
unit of work identifier (LUWID) (col. 10, lines 22-28; col. 12,
lines 5-9; col. 22, lines 54-57).
Britton is generally directed to a two-phase commit
procedure, which is defined as follows (col. 92, line 56 to
col. 93, line 5):
A procedure for coordinating and/or synchronizing a
commit or back out of updates and/or a protected
conversation. Usually, the two phase commit procedure is
used to atomically commit or back out a plurality of
resources or a single resource via a protected conversation.
By way of example, the two phase commit procedure can
include a polling or prepare phase and a back out or commit
phase.
After the phase one prepare-to-commit phase and before the phase
two decision to commit or backout, the resources to be changed
remain in a state of "in doubt" (col. 13, lines 14-21).
The example of a "protected conversation" between
application 56A and application 56D in Britton most closely
corresponds to the claimed "message transfer across a
transaction-oriented data processing network." The protected
conversation is described at column 15, line 1 to column 18,
line 50, with respect to Figs. 5A and 5B, and the timing of the
commits is discussed at column 27, lines 1-36 with respect to
Fig. 9. However, it is difficult to read Britton onto claim 1
because the unit of work in Britton involves an update to
file 78D (col. 16, lines 18-21) in system 50D and to files 78A
and 78B (col. 16, lines 29-30) in system 50A, rather than
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