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Subject: [OASIS Issue Tracker] (ODATA-1071) Nullable Collection Navigation Property
[ https://issues.oasis-open.org/browse/ODATA-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Ralf Handl updated ODATA-1071: ------------------------------ Environment: (was: Schema ) > Nullable Collection Navigation Property > --------------------------------------- > > Key: ODATA-1071 > URL: https://issues.oasis-open.org/browse/ODATA-1071 > Project: OASIS Open Data Protocol (OData) TC > Issue Type: Bug > Components: CSDL JSON , CSDL XML > Affects Versions: V4.0_CS02 > Reporter: George Ericson > Assignee: George Ericson > Labels: Clarification, Errata > Fix For: V4.01_CSD02 > > > There is the assertion: > "Nullable MUST NOT be specified for a collection-valued navigation property, a collection is allowed to have zero items." > A property, regardless of multiplicity consumes a slot in an instance (entity representation). The slot has a sequence of values, depending on cardinality. If the slot has no values, then the property is said to be null. If an entry in a list of values has no value, then that entry is null. So, you can both have a collection property that is null or a collection property consisting of a list of null values. After much discussion, the DMTF specified the following for the values of a collection property (i.e. upper bound on multiplicity > 1) > - NULL: The collection has no specified value. > - [] : The collection has no elements (I.e. size = 0 > - [ Null ] : The collection has one element specified as having no value > - [ "" ] : The collection has one element specified as having the empty string > - [ "x", Null, "y",...] : The collection has multiple elements, some may be specified as having no value. > The collection representing the list of values is not a separate modeled entity, rather it is a representation of the value list of the property itself. -- This message was sent by Atlassian JIRA (v6.2.2#6258)
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