<textarea mo:type="EditArea" mo:name="${fieldName}" 
     mo:props="
       nonBlank        : ${nonBlank}, 
       maxLength       : ${maxLength},
       valHandler      : ${valHandler}, 
       valErrorHandler : ${valErrorHandler}">
    <xsl:value-of select="${value}" />
  </textarea>

${fieldName}

The name of the ProcessField

${nonBlank}

If "true" then the field cannot be left blank

${maxLength}

The maximum number of btys that can be entered into the field

${valHandler}

The name of the validation handler function

${valErrorHandler}

The name of the validation error handler function.