enumerationDef support for element text() values

[Jim Tivy <jimt@bluestream.com>]

Hi Folks

From time to time users of DITA will define elements where they wish to constrain the set of values possible to a "pick list". This can be done today using enumerationdefs with subjectSchemes for attribute values but not for element text() values. My question is, why was this enumertiondef mechanisms only implemented for attributes or attributes within an element and not element values as well.

It would seem reasonable that the use of enumerationdef be extended to support element values.

I could see use of this ranging from visible partNumbers to prolog change-item values to specialized element 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>

Jim