[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=32588#action_32588 ] 

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

Just thought of a better wording.
"
5.2.1 Required
If the Required attribute constraint for an attribute in a resource definition has value "false", then messages associated with that resource are valid both with and without the attribute present.

If the value is "true" then those messages are valid only if the attribute is present.
"

> 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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