[jats-list] Automated object numbering, and empty <xref>s to objects (Archiving v3).

["Newton, Simon - Edinburgh" <snewton@xxxxxxxxx>]

Dear fellow subscribers,

(1) It seems from the element reference page for <chem-struct-wrap> that one
could omit explicit labels because "A <chem-struct-wrap> may also be numbered,
automatically by a formatting application or by preserving the number inside a
<label> element." Having seen this, but not found similar comments about
"automatic numbering" for other elements that may typically be
numbered/labelled, I would like to know what the assumption is about omitting
labels in general for these (e.g. chemical structures, equations, figures,
tables, etc.): is a formatting application expected by default to generate a
number/label? If so, is there a way to suppress numbering for some
occurrences?
(2) Relatedly, what is the expected behaviour for an <xref> element that has
no content (e.g. one that (a) references an element for which automatic
numbering has been assumed and which therefore lacks a <label>, or (b) one
that references an element possessing a <label>)?

Many thanks - Simon.
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