Use of empty tags in docbook xml?

["David O'Brien" <david.obrien@redhat.com>]

Hi List.

Is there a general opinion on using empty tags in docbook xml?

e.g., occasionally in a 3-col table, one cell doesn't require an entry,
so I leave an empty <entry> tag. This has popped up in other places as
well, but I'm just wondering if there is a preferred method for dealing
with this.

Is there a non-displayable character I can use, perhaps?

thanks for any suggestions.
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