demos/xml-bigbank/src/main/resources/customer.xsd

<?xml version="1.0" encoding="UTF-8"?>
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<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.com/customer"
    targetNamespace="http://example.com/customer" elementFormDefault="qualified">
    <element name="customer" type="tns:Customer" />
    <complexType name="Customer">
        <sequence>
            <element name="id" type="string"></element>
            <element name="firstName" type="string"></element>
            <element name="lastName" type="string"></element>
            <element name="accounts" type="tns:Accounts"></element>
        </sequence>
    </complexType>
    <complexType name="Accounts">
        <choice>
            <element name="checking" type="tns:Account"></element>
            <element name="saving" type="tns:Account"></element>
            <element name="stock" type="tns:Stock"></element>
        </choice>
    </complexType>
    <complexType name="Account">
        <attribute name="id" type="string"></attribute>
        <attribute name="balance" type="float"></attribute>
    </complexType>
    <complexType name="Stock">
        <attribute name="symbol" type="string"></attribute>
        <attribute name="quantity" type="int"></attribute>
    </complexType>
</schema>