versions.xml

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/Versions" xmlns:tns="http://www.example.org/Versions" elementFormDefault="qualified">
    <complexType name="LibraryType">
        <sequence>
            <element name="URL" maxOccurs="unbounded" minOccurs="1">
                <complexType>
                    <simpleContent>
                        <extension base="anyURI">
                            <attribute type="integer" name="priority" />
                        </extension>
                    </simpleContent>
                </complexType>
            </element>
        </sequence>
    </complexType>

    <complexType name="VersionType">
        <sequence>
            <element type="anyURI" name="BaseJarFile" maxOccurs="1" minOccurs="1" />
            <element type="anyURI" name="PatchFile" maxOccurs="1" minOccurs="0" />
            <element type="tns:LibraryType" name="Library" maxOccurs="unbounded" minOccurs="0" />
        </sequence>
        <attribute type="string" name="identifier" use="required" />
    </complexType>

    <element name="Versions">
        <complexType>
            <sequence>
                <element type="tns:VersionType" name="Version" maxOccurs="unbounded" />
            </sequence>
        </complexType>
    </element>
</schema>