[INFOD-WG] Property constraints example

[Dieter Gawlick]

Steve,

In the car buyer/dealer use case I assumed that the names of the 
vocabularies are unique - just to make it more readable. In this case 
you don't need an EPR. Obviously, if vocabulary names are not unique the 
constraint has to use an EPR as vocabulary identifier; I don't think 
that we have to discuss this in the specification but the use case 
should be more explicit - the specifications point to the use cases. 
Please add a comment and I will extend the text.

Distance functions are well established for managing spatial data. If 
you like, I could add a note.

Dieter

Fisher, SM (Steve) wrote:
> Dieter,
>
> I have started going through the use cases - in particular trying to
> understand how to handle "disable new".
>
> I find there is no example of a property constraint in the first use
> case. The first examples I see are on page 34 where we have: for the Car
> Dealer
>
> <infod:PropertyConstraint>
>      Car_Buyer (Distance < 30 miles) and CR > 4) 
> </infod:PropertyConstraint> 
>
> On page 35 in Registration of Car Buyer as Consumer we have:
>
> <infod:PropertyConstraint>
>      Car_Dealer (Dealer: Years in business > 10 years, BBB rating > 3,
> Service rating > 10) </infod:PropertyConstraint>
>
> On page 36 in Car Buyer adds Subscription we have:
>
> <infod:PropertyConstraint> 
>      Distance (CarCommunityDealerVocabEPR.Location,  
>  
> http://www.carcommunity.com/CCInfoDRegistry/CarBuyerr/Susan_Maria_Callas
> ) < 25
> </infod:PropertyConstraint>  
>
> With the first two, how is the system expected to know what a Car_Buyer
> and Car_Dealer is. Surely we need the EPR of a property vocabulary
> somewhere - then we have the explicit dependency upon the property
> vocabulary.
>
> For the last one - where is the function distance defined, how does the
> URL return coordinates and in what frame and units?
>
> Steve
>   

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Dieter Gawlick | Architect | 650.506.8706
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