Coded TIME_PERIOD?

[hoehrmann]

https://github.com/sdmx-twg/sdmx-json/blob/71fe5eaa9fcd29e3c15f2f0216a19b9b650b1dbd/data-message/docs/1-sdmx-json-field-guide.md contains this example:

	"observation": [
		{
			"id": "TIME_PERIOD",
			"name": "Time period or range",
			"names": { "en": "Time period or range" },
			"values": [
				{
					"id": "2013-01-18",
					"name": "2013-01-18",
					"names": { "en": "2013-01-18" }
				}, {
					"id": "2013-01-21",
					"name": "2013-01-21",
					"names": { "en": "2013-01-21" }
				}
			]
		}
	]

Using values[*].id is allowed only for coded values, but TIME_PERIOD would usually be the TimeDimension which cannot be coded. This seems to be a leftover from a time where there was no values[*].value property.

(In doubt, please handle this as a public review comment on SDMX 3.1 once the comment period begins.)