In my opinion, there should not exist any placeholder for Foreign Keys. If a FK is mandatory, you need to publish it. If not, just make them optional. If you put a placeholder in a FK, then the word mandatory has no real meaning.

On Mon, Oct 26, 2009 at 1:12 PM, <stephen.burke@stfc.ac.uk> wrote:
> (other than an implication in the placeholder
> section that strings may be UTF-8).

While I'm at it, another thing that came up recently was that we don't
seem to have a placeholder for unique IDs, e.g. a mandatory foreign key.
Do you have any suggestions? (So far I went for "$UNDEFINED$" in the
absence of inspiration ...)

Stephen
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