[glue-wg] Placeholder for IDs?

[stephen.burke at stfc.ac.uk]

> (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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