public List<IdentifierContract> GetDefiningIdentifierList( Serializable obj )
Gets a list of all identifier codes that define this coordinate system. If the first code defines the actual object as-is, then that will be all, but if there are sub-changes then those IDs will also be returned:
For a projected coordinate system, it will return its own GC code, the Geodetic system's GC code, and the linear unit's GC code
For a geodetic coordinate system, it will return its own GC code and the angular unit's GC code
For a geocentric coordinate system, it will return its own GC code, the Geodetic system's GC code, and the linear unit's GC code
For a vertical coordinate system, it will return its own GC code, the datum's GC code, and the linear unit's GC code
For a early bound coordinate system, it will return its own GC code and the transform's GC code