Re: FSL engine for Sesame

From: Ryan Lee <>
Date: Mon, 05 Dec 2005 21:53:37 -0500

Emmanuel Pietriga wrote:
> Ryan Lee wrote:
>> Emmanuel Pietriga wrote:
>> Are we agreed at all about how prefix mapping looks when using FSL in
>> Fresnel? I recall we said we weren't going to solve this problem in a
>> standard form after much discussion, and, accordingly, the manual has
>> no information on how to do it. I could try to come up with something
>> in my own implementation, though it might be hard since I don't think
>> Sesame 1.x records prefix maps in its models.
>> Chris' example Fresnel configurations contain this sort of approach:
>> """PREFIX rdf: <>
>> PREFIX ex: <>
>> rdf:Class[ex:something]"""^^fresnel:fslSelector
>> which seems to bring into question what exactly a fresnel:fslSelector
>> datatype means (though his examples do predate the precise invention
>> of that datatype).
> I took the path of "each application does it as it wants":
> - in the IsaViz engine (visual FSL debugger), the namespace prefixes are
> taken from all the declarations in the Namespaces tab of the GUI
> - in the Jena and Sesame 2 engines, there is a class FSLNSResolver that
> has to be instantiated by programmers using these engines when they
> create a new FSLEvaluator object. This FSLNSResolver class having a
> simple API for declaring namespace prefix bindings.

I may have to opt for Longwell to have some independent configuration
for this. I don't believe there is a programmatic way to extract
namespace info in Sesame 1.2.2 and guarantee its correctness.

Ryan Lee       
W3C Research Engineer    +1.617.253.5327
Received on Tue Dec 06 2005 - 02:47:11 EST

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