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Forum Topic - epr's for stage in / out: (2 Items)

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07/15/2005 7:24 AM

post4672

epr's for stage in / out

This is a comment about the references to stage in and out element in JSDL documents. 

Currently, the schema allows a sequence of URI, followed by or xsd:any (both minoccurs = 0). There seems to be two 
popular schools of thought regarding how one goes about pointing to things  two popular options are a URL or use an EPR.
 

I understand that JSDL is not dealing with the pro's and con's of this issue, and I recognising that JSDL is supposed to
 be delivery mechanism agnostic.

That said, I imagine a lot of people will be delivering their JSDL messages, with WSRF-type SOAP headers. In such a 
world, it makes sense to me that one might use a EPR to point to something which is handling the staging. Infact, I can 
see some advantages in doing it this way. 

However, JSDL only has 'typed' support from URL's. Would it not be nice to include types support for EPR's too. Or, make
 the whole thing xsd:any. That's fairer ...

Roger

Michel Drescher

07/15/2005 7:47 AM

post4673

Re: epr's for stage in / out

Dear Roger,

thanks for your comment.

The reason why there is a "typed" support for URLs is historic. EPRs popped up considerably late in the JSDL 
specification process, at a time, where it was paramount to get JSDL v1 out to the public.

There is no reason for us to prefer URLs over any other means.

In fact, we expect EPRs and other means of addressing remote (file) resources to emerge and be used as extensions to 
JSDL. So at least from my point of view, "native" EPR support in JSDL will eventually appear as a normative extension to
 JSDL.

Best regards,
Michel

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