Latitude <-90 or >90 should compare as -90 or 90 respectively.
Longitude <-180 or >180 should compare as lng+360n and lng-360n respectively, where n is such that the longitude ends up in the range (-180,180].
Alternatively you could tighten the abnf, although that significantly harms readability it does remove the problems inferred by S9.1.
A value of 40.323 should compare equal to a value of 40.3230 (I assume that this is what you mean by mathematically equal, but we've had problems with that in the past..)
4.4.3 says that "Hence, an altitude value of 0 MUST NOT be interpreted as "on earth's surface"." Given that this is occasionally, if rarely, the case you would be better to state: "Hence, an altitude value of 0 cannot automatically be assumed to be either ground or sea level."
4.9 contact can also refer to this WG.
Examples don't need srsDimension specified.
Examples should use the Point forms from RFC 5491 which don't include an explicit EPSG database version in the srsName URN.
--Martin
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