SWE Common DataArray values missing options for XML/Text/Binary encodings

[autermann]

The DataArrays values property is defined as either an JSON array or an external reference.

It should also be allowed to inline arrays encded using TextEncoding, XMLEncoding and BinaryEncoding, something like this:

{
  "oneOf": [
    {
      "type": "array"
    },
    {
      "type": "string"
    },
    {
      "type": "string",
      "format": "base64"
    },
    {
      "$ref": "#/definitions/AssociationAttributeGroup"
    }
  ]
}

[alexrobin]

Discussed during 12/12 Telecon.

We decided to keep the schema as-is and only allow JSON or URI (including data-uris).
Add example with a data URI containing base64 data.

Somewhere in SWECommon spec we should mandate that implementations must support at least the following protocols: http://, https:// and data: (RFC 2397).