Re: XML Schema: Alternating "unbounded" elements

This is a very frequently asked question, and the answer is similar for 
Schema and for the older DTDs:

<sequence>
        <choice minOccurs="0" maxOccurs="unbounded">
                <element ref="field1"/>
                <element ref="field2"/>
                <element ref="field3"/>
                <element ref="field4"/>
        </choice>
</sequnce>

The choice lets you pick any one of the fields.  The repetition allows the 
whole choice to be made repeatedly.  In DTD terms this is:

        (field1, field2, field3, field4)*


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Noah Mendelsohn                              Voice: 1-617-693-4036
IBM Corporation                                Fax: 1-617-693-8676
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------------------------------------------------------------------







"Mohan Raj" <mohanrajd@hotmail.com>
Sent by: xmlschema-dev-request@w3.org
04/17/2003 07:37 PM

 
        To:     xmlschema-dev@w3.org
        cc:     (bcc: Noah Mendelsohn/Cambridge/IBM)
        Subject:        XML Schema: Alternating "unbounded" elements




I am fairly new to XML and i searched through the archives but did not 
find 
any solution for this issue.

I am trying to define a schema that can validate the following XML 
document.

<record>
   <field1>
      <value>x
      </value>
   </field1>

   <field2>
      <value>x
      </value>
   </field2>

   <field1>
      <value>x
      </value>
   </field1>

   <field3>
      <value>x
      </value>
   </field3>

   <field2>
      <value>x
      </value>
   </field2>

...

</record>

i have a bunch of fields field1 through field10 and i can have multiple 
occurences of every field (maxOccurs = "unbounded") and they need not be 
in 
a sequence (i.e.
field1 occuring thrice followed by field2 occuring twice etc). these 
elements can alternate as shown above (in any order).

please provide a sample schema that can do something like this. i 
appreciate 
your help.

thanks
mohan


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Received on Friday, 18 April 2003 15:15:29 UTC