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Required and optional elements

From: Spaulding <terryschulting@-------.--->
To: NULL
Date: 8/14/2009 1:42:00 PM
I have an xsd specified as such:

<?xml version="1.0" encoding="UTF-8" ?>
- <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
- <xs:element name="REQUEST">
- <xs:complexType>
- <xs:all>
  <xs:element name="FIELD1" type="xs:string" />
  <xs:element name="FIELD2" type="xs:string" />
  <xs:element name="FIELD3" type="xs:string" minOccurs="0" />
  </xs:all>
  </xs:complexType>
  </xs:element>
  </xs:schema>

I was thinking that this would allow FIELD3 to be optional and that
FIELD1 and FIELD2 are required.  I use JAXB to unmarshal from an XML
doc that does not have FIELD1, and it works.  i would have expected an
exception.  Am i doing this correctly?


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