[OASIS Issue Tracker] (ODATA-843) Nullable as anyOf or as OData-specific keyword

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Ralf Handl created ODATA-843:
--------------------------------

             Summary: Nullable as anyOf or as OData-specific keyword
                 Key: ODATA-843
                 URL: https://issues.oasis-open.org/browse/ODATA-843
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Bug
          Components: OData JSON CSDL
    Affects Versions: V4.0_WD01
            Reporter: Ralf Handl
             Fix For: V4.0_WD01


JSON Schema treats null as a separate data type, requiring an "anyOf" construct for nullable properties:

        "Supplier":{
          "anyOf":[{
              "$ref":"#/definitions/ODataDemo.Supplier"
            }, {
              "type":"null"
            }
          ],

If we accept that OData-unaware JSON Schema validators will complain wrongly if they encounter a null value, we could shorten this to

        "Supplier":{
              "$ref":"#/definitions/ODataDemo.Supplier",
              "nullable":true
            }

This would increase readability for humans and OData-aware machines and significantly reduce the optical size of the JSON CSDL due to the reduced number of line breaks added by pretty printers and JSON Viewers. The actual byte size reduction isn't significant.



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