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Subject: [OASIS Issue Tracker] (ODATA-1071) Nullable Collection Navigation Property
George Ericson created ODATA-1071: ------------------------------------- Summary: 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 Environment: Schema Reporter: George Ericson Assignee: George Ericson 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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