Version history in revision CR 10-31

[jolla56]

New property “revisions”:

"revisions": {
    "description" : "$$TT: Array of previous versions of this news object. See http://spec.tt.se/revisions.html",
    "type": "array",
    "items": {
        "type": "object",
        "additionalProperties" : true,
        "properties" : {
            "uri" : {
                "description" : "$$TT: The identifier of the previous revision.",
                 "type" : "string",
                "format" : "uri",
                "required" : true
            },
            "slug" : {
                "description" : "$$TT: Short name given to article while in production.",
                "type": "string",
                "required" : false
            },
            "replacing" : {
                "description" : "$$TT: Array of identifiers this revision is replacing.",
                "type" : "array",
                "required" : false,
                "items" : {
                    "type": "string",
                    "format" : "uri"
                }
            }
        }
    }
},

Rationale for the change: (free-text)

Compare with http://dev.iptc.org/ninjs-CR-10-30-Replacing

That property says that item B replaces item A.

Revisions hold the complete story back to the starting item(s).

An example from TT:

"revisions": [
    {"uri": "http://tt.se/media/text/170804-frivmfarah-508739","slug": "frivm-farah"},
    {"uri": "http://tt.se/media/text/170804-frivmfarahuv-508797","slug": "frivm-farahUV","replacing": ["http://tt.se/media/text/170804-frivmfarah-508739"]},
    {"uri": "http://tt.se/media/text/170804-frivmfarahuv2-508803","slug": "frivm-farahUV2","replacing": ["http://tt.se/media/text/170804-frivmfarahuv-508797"]}
],