Re: [TF-PP] Questions on Property Paths

On 9 Oct 2009, at 17:15, Seaborne, Andy wrote:
>> -----Original Message-----
>> From: [ 
>> ]
>> On Behalf Of Steve Harris
>> Sent: 08 October 2009 12:50
>> To: Group
>> Subject: [TF-PP] Questions on Property Paths
>> I've just read through the document Andy posted:
>>  and I have a couple of questions:
>> Is the () construct particularly useful? Without have tried it it  
>> does
>> seems like it might make the design much harder to implement that if
>> it was absent. Though I'd welcome evidence to the contrary.
> With foaf:knows, the foaf:Person is connected to another foaf:Person  
> by a single property.  Sometimes, the link from one resource to the  
> next is via two of more properties so
> ?x (:p/:q)+ ?y

OK, I can see that you can't do that without that syntax.

Do you have any feel for how much effort it was to do an implementation?

>> "Cycles in paths are possible and are handled." in any particular  
>> way?
> Rough wording. Cycles exist naturally so have to be handled but  
> that's an implementation issues.  It might be by tracking visited  
> nodes, or it might be just part of some algorithm. (e.g. Floyd- 
> Walshall does not have special cases for cycles).

OK, so you're not proposing any particular solution at this point?

- Steve

Received on Friday, 9 October 2009 16:46:29 UTC