SourceGroup 

A source can be a host or a vendor

Element Group Information

Model

Hosts , Vendor
Children: Hosts, Vendor

Source 

<xs:group name="SourceGroup">
  <xs:annotation>
    <xs:documentation>A source can be a host or a vendor</xs:documentation>
  </xs:annotation>
  <xs:sequence>
    <xs:element ref="Hosts"/>
    <xs:element ref="Vendor"/>
  </xs:sequence>
</xs:group>