libopc/third_party/libxml2-2.7.7/test/schemas/choice_1.xsd

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="doc">
    <xs:complexType>
      <xs:sequence>
        <xs:choice minOccurs="0" maxOccurs="1">
          <xs:element name="a"/>
          <xs:element name="b"/>
        </xs:choice>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>