Notes:
[1. Mostly looking to confirm, "No, they can't."]
[2. Would be pleased to learn of a (DTD, not Schema) work-around/kludge ? Thx.]

Question:
Do XML DTDs let me express this?  "Must be at least one, can be many."

I know that:
  foo? means 0 or 1.
  foo* means 0 or many.
  foo  means 1 (and only 1).

I would like to have a DTD to constrain these 3 data examples:

1. NO: 0 'bar'
<foo>
</foo>

2. YES: 1 'bar'
<foo>
  <bar>stuff</bar>
</foo>

3.  YES: "N" 'bar's
<foo>
  <bar>stuff a</bar>
  <bar>stuff b</bar>
</foo>


This is NOT it:
<!ELEMENT foo (bar)*>

This is NOT it, either:
<!ELEMENT foo (bar)?>

NOR this:
<!ELEMENT foo (bar)>

THANK YOU.
William Reilly
Cambridge, Mass. USA