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 append()
 Append a row (record) to the workarea
------------------------------------------------------------------------------
 Prototype

     ERRCODE append(
                     WORKAREAP wa
                   )

 Arguments

     wa is a pointer to self.

 Description

     Appends a row to the workarea defined by wa.

 Default Behavior

     You must implement the default behavior of this method through a
     subclass.

 Implementation Notes

     .  append() allows the addition of a blank record to the workarea
        defined in wa and places the workarea cursor at the new row position.

     .  append() should make a call to goCold() before appending a row
        and resolve (or cancel) pending relational moves.

     .  On workareas marked as wa->shared, pay strict attention to
        network etiquette during the append.  On workareas marked as
        wa->readonly, raise a recoverable error.

 Files:  Header file is Rdd.api.