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Subject: [OASIS Issue Tracker] Commented: (SAF-6) SignatureComposition/Decomposition and Partial matches

    [ http://tools.oasis-open.org/issues/browse/SAF-6?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=25242#action_25242 ] 

Jeffrey Vaught commented on SAF-6:

Regarding composition of syndromes: The TC disagrees with last comment about Syndrome Store.  A composition of Syndromes might be possible via the catalog entries.  Furthermore, location of the symptom nodepaths is implementation dependent, ie: the signature doesn't need /symptomstore/symptom nodepath, only the critieria in the brackets.
One approach is to avoid Syndrome references altogether by emitting a symptoms for every activated Syndrome (and using the Symptom in the signature traditionally).
Ongoing discussion.

> Signature Composition/Decomposition and Partial matches
> -------------------------------------------------------
>                 Key: SAF-6
>                 URL: http://tools.oasis-open.org/issues/browse/SAF-6
>             Project: OASIS Symptoms Automation Framework (SAF) TC
>          Issue Type: Task
>            Reporter: Jeffrey Vaught
>            Assignee: Jeffrey Vaught
>            Priority: Critical
> As termed in the Spec (Future Development): While the Signature in a Syndrome is specified as a single XPath expression, it is acknowledged by the authors that processing of this expression may be performed incrementally to reflect the dynamic nature of Symptom creation. It may be necessary to decompose, explicitly in the specification, this XPath expression into a conjunction of multiple, simpler expressions.  
> .
> Original discussion:
> Consider Syndrome #1 that has a signature of A & B & C within 10 minutes.  Symptoms A & B are generated.  Should the diagnostician detect the partial match and "recommend" Syndrome #1 has a possible diagnosis?   If the answer is "yes", we may need to add additional elements to our signature definition to accommodate such a scenario.  IMHO (Jeff and seconded by Dave) - better to factor this out to different Syndromes, ie: Syndrome #1 is A&B&C, but Syndrome #2 is A&B.  Now, if Symptoms A&B are generated, then Syndrome #2 is diagnosed and its associated prescription "could" tease Symptom C into existence - ultimately causing Syndrome #1 to be diagnosed.
> Additional discussion from 11/5/2009: 
> Might need sets/unions of xpath2 expressions in order to be fully decomposable (such as by authoring tools).
> For example, consider case where A is followed by B is followed by C within a 5 minute time window.  Below might be XQuery, not XPath, but for sake of argument should be Ok.
> (: ABDI time sequence query :)
> let $a := //SYMPTOM[CONTENT/MSG='INFO:bobcat_command, command'] intersect //SYMPTOM[CONTENT/EXTRA='APPSRVMN']
> let $b := //SYMPTOM[CONTENT/MSG='INFO:bobcat_command, waiting command completed'] intersect //SYMPTOM[CONTENT/EXTRA='APPSRVMN']
> let $c := //SYMPTOM[CONTENT/MSG='INFO:bobcat_command, command ended with exit code: 1'] intersect //SYMPTOM[CONTENT/EXTRA='APPSRVMN']
> return 	if (boolean($a) and boolean($b) and boolean($c) and
> 	($a/TIME < $b/TIME) and ($b/TIME < $c/TIME) and
> 	($c/TIME - $a/TIME < 300))
> 	then concat($a,$b,$c) 	else ()
> While it is possible to compose such an expression, it may not be possible to decompose that expression into its constituents (A, B, C, causal relation between them, and 5 minute constraint).

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