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Subject: [OASIS Issue Tracker] Updated: (ODATA-447) Rename Metadata URL to Context


     [ http://tools.oasis-open.org/issues/browse/ODATA-447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-447:
-----------------------------

    Component/s:     (was: OData ABNF Construction Rules)

> Rename Metadata URL to Context
> ------------------------------
>
>                 Key: ODATA-447
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-447
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData ATOM Format , OData CSDL, OData JSON Format, OData Protocol , OData URL Conventions 
>    Affects Versions: V4.0_CSD01
>         Environment: [Proposed]
>            Reporter: Ralf Handl
>            Assignee: Michael Pizzo
>             Fix For: V4.0_CSD02
>
>
> We've been adding a lot of information into the metadata URL: the metadata base URL, the entity set, the derived type, the selected properties, ...
> This requires clients to parse this string, taking away some of the simplicity of using transport formats for structured data (JSON, XML).
> We could represent the metadata URL in parsed syntax:
> JSON
> - rename the odata.metadata annotation to odata.context
> - make it an object with properties
> -- url: string
> -- set: string
> -- type: string (qualified name, (relative) url, "$ref")
> -- projection: array of selected properties as strings or objects, the latter having name-value pairs name, recursive, projection
> Atom
> - replace the metadata:metadata attribute with a metadata:context element
> - structure is
> -- url: xs:anyUri
> -- set: SimpleIdentifier
> -- type: string
> -- projection: ...
> No change to the odata.metadata=none | full | minimal in the json format parameter.
> In the docs refer to the "odata context".
> Example
> metadata URL:
>   "odata.metadata":"http://host/service/$metadata#Employees/Sales.Manager(DirectReports+(FirstName,LastName))"
> context object:
>   "odata.context":{
>     "url":"http://host/service/$metadata";,
>     "set":"Employees",
>     "type":"Sales.Manager",
>     "projection":[
>       "*",
>       {
>         "property":"DirectReports",
>         "recursive":true,
>         "projection":[
>           "FirstName",
>           "LastName"
>         ]
>       }
>     ]
>   }

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