xml-dev - DDML Section 2.3.7: Nested SEQs within SEQ

["Amit Rekhi" <amitr@abinfosys.com>]

Hello,

PROBLEM STATEMENT
I was going thru Section 2.3.7 of the DDML spec and 
could not understand why the content model for 'Seq'
<!ELEMENT Seq ((Choice | Ref | Model),(Choice | Ref | Model)+)>

could not contain nested Seqs .
for eg.
Acc. to the above content model if 
I had an element decl like:
<!ELEMENT Ele1 (A,B,(D,E,F)+,G,H)
The DDML equivalent would be :

<ElementDecl Name="Ele1">
 <Model>
    <Seq>
       <Ref Name="A" />
       <Ref Name="B" />
       <Model>
        <Seq Frequency="OneOrMore">
          <Ref Name="D" />
          <Ref Name="E" />
          <Ref Name="F" />
        </Seq>
       </Model>
       <Ref Name="G" />
       <Ref Name="H" />
    </Seq>
 </Model>
</ElementDecl>

Why is something like the following 
DDML representation not allowed 
(minus the nested <Model>)?

<ElementDecl Name="Ele1">
 <Model>
    <Seq>
       <Ref Name="A" />
       <Ref Name="B" />
        <Seq Frequency="OneOrMore">
          <Ref Name="D" />
          <Ref Name="E" />
          <Ref Name="F" />
        </Seq>
       <Ref Name="G" />
       <Ref Name="H" />
    </Seq>
 </Model>
</ElementDecl>

Thanks in advance for any replies,

Amit Rekhi
mailto:amit@abinfosys.com
Software Engineer
A.B. Infosys Private Limited
http://www.abinfosys.com
Ph: 91-011-6512816,6512822
Fax: 91-011-6518873












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