enumerationDef support for element text() values

<change-item product="productA productB">
      <change-person>Tom Cihak</change-person>
      <change-organization>JEDEC</change-organization>
      <change-completed>2013-03-23</change-completed>
      <change-summary>Made change 1 to both products</change-summary>
      <data>Details of change 1</data>
    </change-item>