Hi Barry,
Thanks, I did not know about the SPARQL Service Description. It seems to
be exactly the thing that is needed to communicate things like service
limitations. The way one can access the service description is nice and
straightforward. However, I can't see any standard service properties
that could be used for making service limitations known. Perhaps
sd:Feature
<http://www.w3.org/TR/sparql11-service-description/#sd-Feature> could be
extended, but if I create my own extension, how could that be of help to
an agent probing the endpoint?
Regards,
Frans
On 8-10-2013 12:05, Barry Norton wrote:
Frans, SPARQL 1.1 introduced the notion of Service Descriptions [1].
Although these probably don't go far enough in the standard they are,
I believe, extensible.
Barry
[1] http://www.w3.org/TR/sparql11-service-description/
On Tue, Oct 8, 2013 at 10:46 AM, Frans Knibbe | Geodan
<[email protected] <mailto:[email protected]>> wrote:
Hello,
I am experimenting with running SPARQL endpoints and I notice the
need to impose some limits to prevent overloading/abuse. The
easiest and I believe fairly common way to do that is to LIMIT the
number of results that the endpoint will return for a single query.
I now wonder how I can publish the fact that my SPARQL endpoint
has a LIMIT and that is has a certain value.
I have read the thread Public SPARQL endpoints:managing (mis)-use
and communicating limits to users
<http://lists.w3.org/Archives/Public/public-lod/2013Apr/0198.html>, but
that seemed to be about how to communicate limits during querying.
I would like to know if there is a way to communicate limits
before querying is started.
It seems to me that a logical place to publish a limit would be in
the metadata of the SPARQL endpoint. Those metadata could contain
all limits imposed on the endpoint, and perhaps other things like
a SLA or a maintenance schedule... data that could help in the
proper use of the endpoint by both software agents and human users.
So perhaps my enquiry really is about a standard for publishing
SPARQL endpoint metadata, and how to access them.
Greetings,
Frans
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