[OASIS Issue Tracker] (ODATA-1135) Document use of JSON $schema

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

    [ https://issues.oasis-open.org/browse/ODATA-1135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=68505#comment-68505 ] 

Ralf Handl commented on ODATA-1135:
-----------------------------------

CSDL JSON is an OData-specific JSON dialect that has nothing in common with JSON Schema. 

A CDSL JSON document MUST validate against the CSDL JSON meta schema.

A CSDL JSON document need not validate against the JSON Schema meta schema:

{
    "$Version": "4.0",
    "allOf": {
        "$Alias": "self"
    }
}

is valid CSDL JSON, defining an empty OData schema (the word "schema" is hopelessly overloaded :-) named "anyOf". 

"anyOf" is a valid OData identifier and happens to be also a JSON Schema keyword. However valid content for an OData schema is not a valid value for the JSON Schema keyword, thus the above document validates against the CSDL JSON meta schema and does not validate against the JSON Schema meta schema.



> Document use of JSON $schema
> ----------------------------
>
>                 Key: ODATA-1135
>                 URL: https://issues.oasis-open.org/browse/ODATA-1135
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: CSDL JSON 
>    Affects Versions: V4.01_CSD03
>            Reporter: George Ericson
>            Priority: Minor
>             Fix For: V4.01_CS01
>
>
> JSON recommends specification of the $schema attribute for validation.
> The specification silently supports this.
> Need to make this explicit.



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