<xs:complexType name="BinaryBooleanExpressionBaseType" abstract="true">
  <xs:annotation>
    <xs:documentation>The BinaryBooleanExpressionBaseType is the base type for binary Boolean expressions.</xs:documentation>
  </xs:annotation>
  <xs:complexContent>
    <xs:extension base="BooleanExpressionBaseType">
      <xs:sequence>
        <xs:element ref="BooleanExpression" minOccurs="2" maxOccurs="2">
          <xs:annotation>
            <xs:documentation>Each BooleanExpression element is one of two Boolean expressions taking part in a binary Boolean expression.</xs:documentation>
          </xs:annotation>
        </xs:element>
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>