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Subject: [OASIS Issue Tracker] Commented: (ODATA-185) Nullable attribute should be required to be false for collection valued navigation properties.
[ http://tools.oasis-open.org/issues/browse/ODATA-185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31909#action_31909 ] Michael Pizzo commented on ODATA-185: ------------------------------------- This doesn't quite address the issue. The point is, it isn't valid to specify nullable=true for a collection valued property; the collection is always there, it may just be empty. The easiest way to support this would be to require setting nullable=false for collection-valued properties. > Nullable attribute should be required to be false for collection valued navigation properties. > ---------------------------------------------------------------------------------------------- > > Key: ODATA-185 > URL: http://tools.oasis-open.org/issues/browse/ODATA-185 > Project: OASIS Open Data Protocol (OData) TC > Issue Type: Bug > Components: OData CSDL v1.0 > Affects Versions: WD01 > Environment: [Proposed] > Reporter: Michael Pizzo > Assignee: Michael Pizzo > Priority: Minor > Fix For: WD01 > > > ODATA-24 simplified relationships by moving association information into the navigation property. In doing so, cardinality was represented by the type of the navigation property being either a single entity or a collection of entities. For a single entity, optionality of the entity (i.e., 0 or 1) is represented by a nullable attribute (whose default is false). > For navigation properties that return collections of entities, nullable=true doesn't make sense; the collection always exists, it may just be empty. Thus, collection-valued navigation properties should either: > 1) always specify nullable=false > 2) explicitly prohibit specifying nullable=true, or > 3) disallow the nullable attribute > Note that there is precedence for the set of valid attributes depending on the type (i.e., in specifying property facets). -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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