- From: Gregory Williams <greg@evilfunhouse.com>
- Date: Wed, 21 May 2008 12:06:53 -0400
- To: Semantic Web <semantic-web@w3.org>
Received on Wednesday, 21 May 2008 16:07:36 UTC
On May 21, 2008, at 2:49 AM, Ivan Mikhailov wrote: > (:Tuesday :Sunday) is a good approach for non-SPARQL data retrieval, > say, for explicit graph traversal. Due to scalability reasons, SPARQL > has no features to deal with collections. Hence all what one can do > with > SPARQL and (:Tuesday :Sunday) is to retrieve the head of the > collection > and access it from application, making negation logic inside the > application. That's quite OK if the application is co-located with the > data source, otherwise one had to query for sequence items in sequence > via net with all related ping times. Since there are at most seven items in the list in this example, it should be possible to construct a single SPARQL query using chained OPTIONAL blocks to get all the :closingDays values. .greg
Received on Wednesday, 21 May 2008 16:07:36 UTC