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Proposal:
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The metadata:type attribute is required for properties with types other than Edm.String
Accepted: https://www.oasis-open.org/committees/download.php/48411/odata-meeting-27_on-20130228-minutes.html#odata-200
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Resolution:
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https://www.oasis-open.org/committees/download.php/48441/odata-atom-format-v4.0-wd01-2013-03-05-RH.doc
https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/metadata.xsd?rev=205
Accepted: https://www.oasis-open.org/committees/download.php/48549/odata-meeting-29_on-20130314-minutes.html#odata-200
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Improvement
Trivial
The rules are not clearly defined in the contribution, but the intent was that, if metadata:type is not specified, the type is assumed to be string. So it is optional for primitive types, but its absence implies string.
ATOM was intended to be self-describing. Currently you do not need metadata in order to interpret the payload. Not defining a specific meaning to metadata:type being missing for a primitive type would be the first case where metadata was required to interpret the ATOM payload.