Review Appendix A, "Possible VOTable extensions" #53
Description
As mentioned in #51, Appendix A ("Possible VOTable extensions") has a number of things that are not consistent with the current state of VOTable, other standards or intended uses.
As this appendix was somewhat speculative, perhaps it could be reduce to listing common patterns that have evolved with VOTable, or indeed removed entirely. For parts that are still considered valuable, we should certainly update the examples to be compliant with current standards and guidance.