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Re: [dxwg] Use Case: Negotiation by Coordinate Reference System

From: Lars G. Svensson via GitHub <sysbot+gh@w3.org>
Date: Thu, 09 Aug 2018 11:37:48 +0000
To: public-dxwg-wg@w3.org
Message-ID: <issue_comment.created-411728226-1533814667-sysbot+gh@w3.org>
@prushforth scripsit
> MapML takes the approach of defining its own domain of values for "projection"/ TCRS. The register of values and their definition is in the specification, so it's self-contained / descriptive.

Despite having spent two years on the SDW WG, I'm obviously not yet familiar with all gespatial lingo... What exactly is a TCRS? I guess it's some kind of Coordinate Reference System, but I can't make out the T.

> The register of values and their definition is in the specification, so it's self-contained / descriptive.

Who manages that registry and what is the process of adding new values? 

> With language, there exists an accepted standard for the domain of values, which is not the case for CRS.

> I've never seen someone inventing their own language code, but I'm pretty sure this is a regular occurrence for CRS.

As with all conneg related things, there are registries of allowed/accepted values (managed by IANA) and there are process in place to add new values (e. g. http headers or language tags) to them. Is there a canonical registry for CRSs?

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