<xsd:element name="Contribution">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element ref="ContributionAmount" minOccurs="0" maxOccurs="unbounded" />
            <xsd:element ref="ToDateAmount" minOccurs="0" maxOccurs="unbounded" />
            <xsd:element ref="Loan" minOccurs="0" maxOccurs="unbounded" />
        </xsd:sequence>
        <xsd:attribute name="typeContribution" use="required">
            <xsd:simpleType>
                <xsd:restriction base="xsd:string">
                    <xsd:enumeration value="ER" />
                    <xsd:enumeration value="Person" />
                    <xsd:enumeration value="Qual" />
                    <xsd:enumeration value="QualNonElective" />
                </xsd:restriction>
            </xsd:simpleType>
        </xsd:attribute>
        <xsd:attribute name="currencyCode" type="CurrencyCodeType" />
        <xsd:attribute name="planType" type="planTypePatternExtensionType" use="required" />
        <xsd:attribute name="contributionType">
            <xsd:simpleType>
                <xsd:restriction base="xsd:string">
                    <xsd:enumeration value="Pretax" />
                    <xsd:enumeration value="Posttax" />
                </xsd:restriction>
            </xsd:simpleType>
        </xsd:attribute>
    </xsd:complexType>
</xsd:element>