Since there has been some general discussion of alternatives
to JESS for this NMS application, I would like to suggest
another alternative: OPSJ. OPSJ is a Java-based rule system,
but it is quite different from JESS. OPSJ is designed primarily
for building rule-based components. For this reason, we have
tried to eliminate the "mismatch" between proprietary rule
languages (such as OPS5 or CLIPS) and more conventional languages
such as Java. In particular, OPSJ operates directly on arbitary
Java classes; there is no special "fact" type. Also, OPSJ can use
any Java API directly. No glue code or special declarations are
required.
OPSJ uses an advanced form of the Rete algorithm known as Rete
II to give it much better performance than Rete-based tools
such as CLIPS. Information about OPSJ can be found on the PST
web site, http://www.pst.com
-- Charles Forgy
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