Hello,

I'm looking for a solution for the following problem:

I have an "Account" element, which in one condition only contains
values from an enumeration and in the other a formated string
"<Domain>\<UserName>" AND the attribute "Password".

The solution I have actually is to use a union of simple types and
set the attribute optional. But I want that in the first case not attribute
should set and in the second the attribute should be required. I woun't
use the alternative way of combining two different elements in an
"choice".

This is my actual schema:

<xs:element name="Account" minOccurs="0" maxOccurs="1"
default="LocalService">
  <xs:complexType>
    <xs:simpleContent>
      <xs:extension base="Account">
        <xs:attribute name="Password" type="xs:string" />
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:element>

<xs:simpleType name="Account">
  <xs:union>
    <xs:simpleType>
      <xs:annotation>
        <xs:documentation>Build in accounts</xs:documentation>
      </xs:annotation>

      <xs:restriction base="xs:string">
        <xs:enumeration value="LocalService" />
        <xs:enumeration value="NetworkService" />
        <xs:enumeration value="LocalSystem" />
      </xs:restriction>
    </xs:simpleType>

    <xs:simpleType>
      <xs:annotation>
        <xs:documentation>User accounts</xs:documentation>
      </xs:annotation>

      <xs:restriction base="xs:string">
        <xs:pattern value="^(\.|[\w\-]{1,64})\\\.+$">
          <xs:annotation>
            <xs:documentation><![CDATA[<Domain>\<UserName>]]></xs:documentation>
          </xs:annotation>
        </xs:pattern>
      </xs:restriction>
    </xs:simpleType>
  </xs:union>
</xs:simpleType>

Thank for any hints or a solution.


Kindly reagards from Berlin

Holger
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