[glue-wg] VOTE by 8/1: GLUE 2.1 for describing cloud resources?

[stephen.burke at stfc.ac.uk]

Meredith, David (STFC,DL,SC) said:
> What I'd like to try and avoid, if possible, is making changes to the 2.0 core
> abstract entities because this would require changes to the published 2.0 XSD
> - i.e. new attributes would need to be added to the base XSD. Conversely,
> only adding new attributes to new (cloud) entity sub-types would not
> require change to the base XSD (since we're just extending).  Isn't this the
> whole point for inheritance and sub-type specialisation?

Well, not from my point of view, but XML may have different constraints. In LDAP there is only one schema in the server so changing existing objects is no harder than adding new ones, the problems with upgrading are to do with publishing and querying rather than the schema itself. The advantage of inheritance to me is somewhat the opposite, that if you do change a base type you automatically get it in any derived type. Anyway as far as clouds go it's probably a moot point since I guess you would only want new cloud-related things in the cloud objects.

Stephen

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