[PROJ] ETRFxx to national ETRS89 realizations (e.g. ETRS89-NLD [AGRS2010], RGF93 v2/v2b, ETRS89-HUN [ETRF2000], etc.) (was Re: Time dependency in ETRFxx to ETRFyy coordinate transformations?)

[Even Rouault]

https://docs.ogc.org/as/18-005r8/18-005r8.pdf:

"""datum anchor epoch:  epoch at which a static reference frame matches 
a dynamic reference frame from which it has been derived. Note: Not to 
be confused with the frame reference epoch of dynamic geodetic and 
dynamic vertical reference frames. Nor with the epoch at which a 
reference frame is defined to be aligned with another reference frame; 
this information should be included in the datum anchor definition."

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