See also: IRC log
<csma> A RIF dialect is forward compatible if a conformant implementation will process instances of any future or unknown extension according to the specification of the said extension.
<csma> = to ->
<csma> <object> to <Frame>
<csma> obj[att less-than val]
<csma> exist ?x obj[att->?x] and (?x less-than val)
default would be single valued (so Core users don't need to care about)
e.g. a Prolog like relation of a Frame http://fragrantfish.com/biz-vocabulary#Item.deliveredTo(Item, Item.deliveredTo)
and the Frame representation would be Item(http://fragrantfish.com/biz-vocabulary#Item.deliveredTo -> ?Item.deliveredTo)
we solved a similar transformation in the demo we had at RuleML-2008 between ILog, Oracle BRMS and Prova
the demo at RuleML-2008 http://ruleml-challenge.cs.nccu.edu.tw/?q=node/25
yes, to really support object models we would need to support type information such <Var type=xsd:Integer>X</Var>
<csma> Adrian, my prefered approach to that is that a RIF document should have an accompanying data model doc if needed; e.g. an XML schema, giving all the info about cardinality, data types etc
married(A,B) married(A,C) is valid
<Hassan> excl_assert(P) :- ( P , !, retract(P) ; assert(P)).
logically it is correct, it is only wrong with respect to the application which forbids that someone is married to two different persons
therefore you would need to add constraints
<cke> if married(A,B) married(A,C) is valid, the uncle and aunt relations will be wrong. Maybe we just say this is fine. So far, I try to understand what to do with this.
we could use an optional attribute in XML; by default or when omitted (as in Core) it means singel valued
<cke> in terms of processing, it is just simpler to consider married(A,B) and married(A,C) as valid. The logic will be an additive logic.
semantics of BLD frames can not be changed
due to last call
but in Core we don't have sets
<csma> Right, Adrian. But adding a datatype for sets/list/whatever is something we will have to discuss...
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