Schema definition for XNBT: A format for Xml-encoded NBT

test.xml

<?xml version="1.0" encoding="UTF-8"?>
<n:compound xmlns:n="https://dogforce-games.com/xnbt/2021/XNbtSchema">
    <n:byte key="byte">1</n:byte>
    <n:short key="short">2</n:short>
    <n:int key="int">3</n:int>
    <n:long key="long">4</n:long>
    <n:float key="float">5.0</n:float>
    <n:double key="double">6.0</n:double>
    <n:string key="string">seven</n:string>
    <n:list key="list">
        <n:int>1</n:int>
        <n:int>2</n:int>
        <n:int>3</n:int>
    </n:list>
    <n:array of="byte" key="array">1,2,3,4,5</n:array>
</n:compound>

xnbt.xsd

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" targetNamespace="https://dogforce-games.com/xnbt/2021/XNbtSchema" xmlns:n="https://dogforce-games.com/xnbt/2021/XNbtSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema">

    <xs:simpleType name="array_types">
        <xs:restriction base="xs:string">
            <xs:enumeration value="byte" />
            <xs:enumeration value="int" />
            <xs:enumeration value="long" />
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="end" />

    <xs:complexType name="list">
        <xs:choice>
            <xs:element ref="n:end" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:byte" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:short" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:int" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:long" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:float" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:double" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:string" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:list" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:array" maxOccurs="unbounded" minOccurs="0" />
            <xs:element ref="n:compound" maxOccurs="unbounded" minOccurs="0" />
        </xs:choice>
    </xs:complexType>

    <xs:complexType name="array">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute type="n:array_types" name="of" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="compound">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element name="end" type="n:key_end" />
            <xs:element name="byte" type="n:key_byte" />
            <xs:element name="short" type="n:key_short" />
            <xs:element name="int" type="n:key_int" />
            <xs:element name="long" type="n:key_long" />
            <xs:element name="float" type="n:key_float" />
            <xs:element name="double" type="n:key_double" />
            <xs:element name="string" type="n:key_string" />
            <xs:element name="list" type="n:key_list" />
            <xs:element name="compound" type="n:key_compound">
                <xs:unique name="UniqueChildKey">
                    <xs:selector xpath="*"/>
                    <xs:field xpath="@key"/>
                </xs:unique>
            </xs:element>
            <xs:element name="array" type="n:key_array" />
        </xs:choice>
    </xs:complexType>

    <xs:simpleType name="key">
        <xs:restriction base="xs:string">
            <xs:minLength value="1"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="key_end">
        <xs:simpleContent>
            <xs:extension base="n:end">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_byte">
        <xs:simpleContent>
            <xs:extension base="xs:byte">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_short">
        <xs:simpleContent>
            <xs:extension base="xs:short">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_int">
        <xs:simpleContent>
            <xs:extension base="xs:int">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_long">
        <xs:simpleContent>
            <xs:extension base="xs:long">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_float">
        <xs:simpleContent>
            <xs:extension base="xs:float">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_double">
        <xs:simpleContent>
            <xs:extension base="xs:double">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_string">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="key_list">
        <xs:complexContent>
            <xs:extension base="n:list">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="key_compound">
        <xs:complexContent>
            <xs:extension base="n:compound">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="key_array">
        <xs:complexContent>
            <xs:extension base="n:array">
                <xs:attribute type="n:key" name="key" use="required" />
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:element name="end" type="n:end" />
    <xs:element name="byte" type="xs:byte" />
    <xs:element name="short" type="xs:short" />
    <xs:element name="int" type="xs:int" />
    <xs:element name="long" type="xs:long" />
    <xs:element name="float" type="xs:float" />
    <xs:element name="double" type="xs:double" />
    <xs:element name="string" type="xs:string" />
    <xs:element name="list" type="n:list" />
    <xs:element name="compound" type="n:compound">
        <xs:unique name="UniqueKey">
            <xs:selector xpath="*"/>
            <xs:field xpath="@key"/>
        </xs:unique>
    </xs:element>
    <xs:element name="array" type="n:array" />

</xs:schema>