<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="myNamespace" xmlns:myns="myNamespace" xmlns:xs="http://www.w3.org/2001/XMLSchema"
    attributeFormDefault="qualified" elementFormDefault="qualified">

    <xs:element name="person">
        <xs:complexType>
            <xs:sequence>
                <xs:choice minOccurs="1" maxOccurs="unbounded">
                    <xs:element name="name" type="xs:string"/>
                    <xs:element name="reference-number" type="xs:int"/>
                </xs:choice>
            </xs:sequence>
        </xs:complexType>
    </xs:element>

</xs:schema>