Rob Atkinson a écrit :
IMHO, I think we should carry two (or more) peices of metadata instead of just the CRS definition:

1) projectionDefinitionSource="EPSG:4326"   // source of projection definition 
(independent of serialisation formatting)
2) axisFormat=X,Y
3) numberFormat=DD  // DMS is usually actually specified in EPSG!

Note that the last two are FORMATTING choices, used when outputting data
The definition for the data store may need to mirror these, to specify what happens when inputting data into the feature model.

But those metadata would be outside CRS? I means it would be DataStore (for 
example) metadata?


Of course, SRS need not be coordinates - you could conceivably have a named set of geographies as a referencing system.

GeoAPI (from ISO 19111) has an interface for that:

    SpatialReferenceSystemUsingGeographicIdentifier

(What along interface name!)

This interface is actually empty, but is a kind of hook for future development. I believe that there is an ISO specification (forgot the number) specifically for geographic identifiers.

        Martin.


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