[occi-wg] Removing associations between resources

[Edmonds, AndrewX]

Hey Ralf!

Thanks for bringing this up :-) I'd whole-heartedly agree with you that having clear and simple semantics are a must especially with potentially dangerous operation like DELETE.

Semantics related to removal/deletion of Link, in my view should be divided into two separate but complimentary areas:
1) Unlinking - to unlink one resource from another the use of PUT should be used to update the appropriate resource
2) Destroying a link - to destroy a link resource it must be unlinked from dependent resources using PUT and then finally destroyed using DELETE. If a user attempts to destroy before unlinking then the server should raise an exception. That way there are no dangling references to non-existent resources.

What do you and others think?

Andy


-----Original Message-----
From: occi-wg-bounces at ogf.org [mailto:occi-wg-bounces at ogf.org] On Behalf Of Ralf Nyren
Sent: Sunday, August 08, 2010 3:20 PM
To: occi-wg at ogf.org
Subject: [occi-wg] Removing associations between resources

Hi again,

Reading the specs I cannot quite figure out how to remove an association  
between
one resource and another. As far as I understand PUT can be used to add a  
new
or change an existing association, i.e. using Link headers. But how to  
remove an
association?

Reading the Wiki [1] I found some new text which indicates that DELETE  
somehow
can be used to remove associations as well as resources. The described  
semantics
seemed to be rather complicated.

You have probably thought a lot about this already but from my point of  
view any operation
which irreversibly deletes/destroys a resource should have as simple  
semantics as
possible. Using DELETE to remove associations seem dangerous to me.

What are your thoughts on this matter?

regards, Ralf

[1]  
http://forge.ogf.org/sf/wiki/do/viewPage/projects.occi-wg/wiki/CoreAndModels?wikiPageVersion=21

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