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   Mixed content validity constraint

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  • From: Steve Neely <sjn@1webhighway.com>
  • To: xml-dev@lists.xml.org
  • Date: Fri, 10 Nov 2000 05:25:23 -0600

In the W3C XML 1.0 specification there is a validity constraint on 
mixed content (http://www.w3.org/TR/REC-xml#sec-mixed-content) that 

"Validity constraint: No Duplicate Types

The same name must not appear more than once in a single mixed-
content declaration."

I interpret this as saying you cannot repeat a tag inside a mixed 
content declaration. So the following is not allowed:

<AA>some text
  some mixed content
  <BB>more blah</BB>

Why is this disallowed? In HTML you can legally mark-up many 
different parts within a paragraph with bold tags. For a document model
isn't this is essential?

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