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Dear all:

I just answered a question on how to model bundles with optional choices on

    http://answers.semanticweb.com/questions/18908/grincludesobject-problem

The reply may be relevant for this list, too:


----snip

Currently, you can only model bundles with a defined set of objects in GoodRelations, but not optional choices, like

	• 1 Birthday cake and (1 candy OR 1 flower)
or quantity intervals, like

	• 1 Steak and UP TO 3 side-servings
We are considering to add this at a later point, but what you can do is model TWO gr:Offers (in a pseudo-syntax):

Offer 1
 includesObject 2 Candy
 includesObject 3 chocolates
 includesObject 1 cookie

Offer 2
 includesObject 3 chocolates
 includesObject 2 cookie
 includesObject 1 Candy

That would be semantically equivalent to what I assume you really want to say. Plus it has the advantage that a consuming client (search engine, browser extension, mobile app) does not have to do complex reasoning to expand the rules of allowable objects prior to matchmaking.

The only thing that is missing that way is the information that the two offers are kind of variants of each other. But then again, does it really differ whether the two choices are somehow related, other then by the fact that they include similar objects?

Here is a full example in Turtle syntax:

foo:offer a gr:Offering;
gr:hasBusinessFunction gr:Sell;
# ... other offer properties omitted for readability
gr:includesObject [ a gr:TypeAndQuantityNode;
                    gr:amountOfThisGood "1"^^xsd:float;
                    gr:hasUnitOfMeasurement "C62"^^xsd:string;
                    gr:typeOfGood foo:cellphone ];
gr:includesObject [ a gr:TypeAndQuantityNode;
                    gr:amountOfThisGood "2"^^xsd:float;
                    gr:hasUnitOfMeasurement "C62"^^xsd:string;
                    gr:typeOfGood foo:charger ] .

foo:cellphone a gr:SomeItems;
    gr:name "ACME Cellphone BulkyTalky"
@en
;
    gr:hasEAN_UCC-13 "1234567890123"^^xsd:string .

foo:charger a gr:SomeItems;
    gr:name "ACME Travelcharger"
@en
;
    gr:hasEAN_UCC-13 "2345678901234"^^xsd:string .

I hope that helps. If not, feel free to ask on the GoodRelations mailing list,

	• http://ebusiness-unibw.org/pipermail/goodrelations/
I hope that helps.

Martin Hepp


--------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

e-mail:  hepp at ebusiness-unibw.org
phone:   +49-(0)89-6004-4217
fax:     +49-(0)89-6004-4620
www:     http://www.unibw.de/ebusiness/ (group)
         http://www.heppnetz.de/ (personal)
skype:   mfhepp 
twitter: mfhepp

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