xml/schema/lib/types/sys.xsd

<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified"
           attributeFormDefault="unqualified">

    <xs:include schemaLocation="./gpg.xsd"/>
    <xs:include schemaLocation="./cksum.xsd"/>
    
    <xs:simpleType name="t_sys_diskfmt">
        <xs:restriction base="xs:token">
            <xs:enumeration value="gpt"/>
            <!-- The next four should all evaluate to the exact same in-code. -->
            <xs:enumeration value="bios"/>
            <xs:enumeration value="dos"/>
            <xs:enumeration value="msdos"/>
            <xs:enumeration value="mbr"/>
            <xs:whiteSpace value="collapse"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="t_sys_verifyfile">
        <xs:choice minOccurs="1" maxOccurs="2">
            <xs:element name="gpg" minOccurs="0" maxOccurs="1" type="t_gpg_verify"/>
            <xs:element name="hash" minOccurs="0" maxOccurs="1" type="t_cksum_verify">
                <xs:unique name="uniq_cksum_value_attr">
                    <xs:selector xpath="checksum"/>
                    <xs:field xpath="@hashType"/>
                    <xs:field xpath="."/>
                </xs:unique>
            </xs:element>
        </xs:choice>
    </xs:complexType>

</xs:schema>