Add a Security Domain element to the SystemComplexType

[burnalting]

A system can reside in a Security Domain ... for example the the may be an instance of a System in a Secret security domain and another instance in a Official domain. Equally, one could have domains of Sales , Finance and Research.

This allows to categorize the System itself.

This proposal suggests adding an element called SecurityDomain as a string.

Annotation could be 'An optional element to define the domain that the system exists in.'

Please add between Organisation and Version.

[at055612]

      <xs:element name="SecurityDomain" type="xs:string" minOccurs="0" maxOccurs="1">
        <xs:annotation>
          <xs:documentation>An optional element to define the domain that the system exists in.</xs:documentation>
        </xs:annotation>
      </xs:element>