[PROJ] Creating a dynamic system

[Javier Jimenez Shaw]

Hi

the C function proj_coordinate_metadata_create can
https://proj.org/en/stable/development/reference/functions.html#c.proj_coordinate_metadata_create
allows to create a dynamic system with an epoch.

In case the crs is not dynamic, it fails and emits an error.
However I do not see how to check if a system is dynamic, to call it only
if really needed.

Is there such a function in the C API?

Cheers
Javier.
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