Complete XML schema

Complete XML schema for system description files
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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="System">
    <xs:complexType>
      <xs:all>
        <xs:element ref="Properties" minOccurs="0" maxOccurs="1"/>
        <xs:element ref="Controllers" minOccurs="0" maxOccurs="1"/>
      </xs:all>
    </xs:complexType>
  </xs:element>

  <xs:element name="Properties">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="Property" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name="Property">
    <xs:complexType>
      <xs:attribute name="Name" type="xs:string" use="required"/>
      <xs:attribute name="Value" type="xs:string" use="required"/>
    </xs:complexType>
  </xs:element>

  <xs:element name="Bus">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="Controller" minOccurs="0" maxOccurs="unbounded" />
      </xs:sequence>
      <xs:attribute name="Name" type="xs:string" use="required"/> <!-- since all controllers are freshly created, this name should match the default name -->
    </xs:complexType>
  </xs:element>

  <xs:element name="Controller">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="Properties" minOccurs="0" maxOccurs="1"/>
        <xs:element ref="Controller" minOccurs="0" maxOccurs="unbounded" />
        <xs:element ref="Bus" minOccurs="0" maxOccurs="unbounded" />
      </xs:sequence>
      <xs:attribute name="Description" type="xs:string" use="required" />
      <xs:attribute name="HardwareSerialNumber" type="xs:string" use="required" />
      <xs:attribute name="Id" type="xs:unsignedInt" use="optional" />
    </xs:complexType>
  </xs:element>

  <xs:element name="Controllers">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="Controller" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>