[oslc-core] missing oslc query functionality

[Joe Ross]

We've had a couple of scenarios that don't seem to be addressable using 
the OSLC core 2.0 query syntax:

1. Finding all resources that don't have a particular value for a 
property. 
The != operator won't work for this, because in the case of multi-valued 
properties, records will be returned as long as there is a value that is 
not equal, even if there is also a value that is equal. This would require 
a unary "not" logical operator.

2. Finding all resources that have any value for a particular property 
(matching on predicate, regardless of value).
This is probably would probably be best handled by a unary "exists" 
operator, or support for wildcard as the value in oslc.where clauses. 
Currently the grammar seems to only allow for wildcard for the predicate.

So, am I correct in this assessment? If so, was this omission intentional 
(and if so what was the reason), or an oversight?

================================================
Joe Ross/Austin/IBM, joeross at us.ibm.com
Tivoli Autonomic Computing & Component Technologies
512-286-8311, T/L 363-8311
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