test/jaxp/javax/xml/jaxp/unittest/validation/tck/upa01.xsd

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            elementFormDefault="qualified"
            targetNamespace="foo"
            xmlns="foo"
        >
    <xsd:element name="e1" type="xsd:boolean" />
    <xsd:element name="foo" substitutionGroup="e1" type="xsd:boolean" />

    <xsd:element name="root" type="B" />

    <xsd:complexType name="B">
        <xsd:choice maxOccurs="1000">
            <xsd:element ref="e1" />
            <xsd:element name="foo" type="xsd:int" form="unqualified"/>
        </xsd:choice>
    </xsd:complexType>

</xsd:schema>