[OASIS Issue Tracker] Commented: (CAMP-52) Use of Cardinality for JSON array attributes

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    [ http://tools.oasis-open.org/issues/browse/CAMP-52?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32510#action_32510 ] 

Tom Rutt commented on CAMP-52:
------------------------------

After discussion at the teleconf, I think it suffices to resolve this issue by changing the use of the "cardinality" property in attribute definitions to use instead a  "required" boolean property. 

This would be used for all attribute definitions, not just array attributes.

If there are any special lower bounds on members present for a given array attribute, that could be specified in the text describing the semantics of the attribute in the spec.

> Use of Cardinality for JSON array attributes
> --------------------------------------------
>
>                 Key: CAMP-52
>                 URL: http://tools.oasis-open.org/issues/browse/CAMP-52
>             Project: OASIS Cloud Application Management for Platforms (CAMP) TC
>          Issue Type: Improvement
>          Components: Spec
>            Reporter: Tom Rutt
>
> There are several attributes defined with an array type (e.g, String[] . Link[])
> These attribute definitions have various cardinality values, including, 1, 0..1, or 0..*
>  It makes no sense for an array attribute to have cardinality 0..*, for this implies multiple arrays in the JSON serialization.
> In the case of 0..1 cardinality, Is there a difference in having an array present with 0 elements, versus not having the array present?
> In the case of 1 cardinality, is it allowed to have an array with 0 elements present for its serialization?
> There does not seem to be a way to specify that an array should not be present in the serialization with zero elements.  What is the difference between no attribute in the serialization, verses an array attribute with no elements?

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