alfresco-community-repo/source/test-resources/xforms/tests/schema/empty-extension-test.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:mynsprefix="http://mine.org/mynsuri"
           elementFormDefault="qualified"
           attributeFormDefault="qualified"
           targetNamespace="http://mine.org/mynsuri">

  <xs:simpleType name="yes_or_no">
    <xs:restriction base="xs:normalizedString">
      <xs:enumeration value="yes"/>
      <xs:enumeration value="no"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="element_1">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="yes_no_using_extension" minOccurs="0">
          <xs:complexType>
            <xs:simpleContent>
              <xs:extension base="mynsprefix:yes_or_no"/>
            </xs:simpleContent>
          </xs:complexType>
        </xs:element>
        <xs:element name="yes_no_type" minOccurs="0" type="mynsprefix:yes_or_no"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>