<updatability_clause xmlns="http://www.sqlparser.com/xml/ansi2003">
  <kw_for>{1,1}</kw_for>
  <read_only_or_update_of>{1,1}</read_only_or_update_of>
</updatability_clause>

<xs:element name="updatability_clause">
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="kw_for"/>
      <xs:element name="read_only_or_update_of">
        <xs:complexType>
          <xs:choice>
            <xs:element ref="read_only"/>
            <xs:element ref="update_of_clause" minOccurs="0"/>
          </xs:choice>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<read_only_or_update_of xmlns="http://www.sqlparser.com/xml/ansi2003">
  <read_only>{1,1}</read_only>
  <update_of_clause>{0,1}</update_of_clause>
</read_only_or_update_of>

<xs:element name="read_only_or_update_of">
  <xs:complexType>
    <xs:choice>
      <xs:element ref="read_only"/>
      <xs:element ref="update_of_clause" minOccurs="0"/>
    </xs:choice>
  </xs:complexType>
</xs:element>