<xs:complexType name="PolyadicArithmeticExpressionBaseType" abstract="true">
  <xs:annotation>
    <xs:documentation>The PolyadicArithmeticExpressionBaseType is the base type for arithmetic expressions with operators that operate on two or more expressions and for which the order of the expressions being operated on is irrelevant.</xs:documentation>
  </xs:annotation>
  <xs:complexContent>
    <xs:extension base="ArithmeticExpressionBaseType">
      <xs:sequence>
        <xs:element ref="ArithmeticExpression" minOccurs="2" maxOccurs="unbounded">
          <xs:annotation>
            <xs:documentation>Each ArithmeticExpression expression element is one of the arithmetic expressions being operated on to produce a value.</xs:documentation>
          </xs:annotation>
        </xs:element>
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>