Are elements allowed to nest within themselves?

[Richard L. Goerwitz III]

Just for future reference, this sort of question is easily
answered by a validator.  E.g., go to

  http://www.stg.brown.edu/service/xmlvalid/

and paste in a brief document like the one you posted be-
fore (with a few bits of sugar to make it taste good to
the validator):

<!DOCTYPE foo [
<!ELEMENT foo ( foo*, bar* )>
<!ATTLIST foo answer CDATA #IMPLIED>
<!ELEMENT bar (#PCDATA)>
]>

<!-- top-level "foo" element -->
<foo>
     <!-- first nested "foo" element -->
     <foo answer="yes">
          <bar>this one</bar>
          <bar>that one</bar>
     </foo>
     <!-- second nested "foo" element -->
     <foo answer="no">
          <bar>the other one</bar>
     </foo>
     <!-- third nested "foo" element (empty) -->
     <foo/>
</foo>

Richard Goerwitz
Brown University


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