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Are elements allowed to nest within themselves?

• From: Chris von See <cvonsee@o...>
• To: xml-dev@i...
• Date: Wed, 09 Sep 1998 14:48:33 -0500

The XML 1.0 spec is unclear (unless I missed the reference) on whether or
not an element can nest within itself.  For example, let's say I define a
DTD with:

<!ELEMENT foo ( foo*, bar* )>
<!ATTLIST foo answer CDATA #IMPLIED>

<!ELEMENT bar (#PCDATA)>

and a document with: 

<!-- 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>

Is this legal?


Chris


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