Problems with diminuendo placing with 2 voices

[Phil Holmes]

Hello - my first post.

I'm writing a program (or strictly, an extension to someone else's program) 
to convert Noteworthy Composer2 music to LilyPond.  Mostly, it's working 
well.  However, I've just finished what Noteworthy refers to as RestChords 
(where a rest is chorded with a note, either of equal or greater duration 
than the rest) and chords where the note values of the notes aren't equal. 
I've done this by converting the music to separate voices for the 
rests/notes or for the longer/shorter notes.

However, I can't find a way of making a diminuendo mark appear within the 
LilyPond notation.  An example of the sort of thing I'm trying to do is at 
http://www.holmessoft.co.uk/homepage/images/RestChords.gif

I've translated this to LilyPond as shown at the bottom of the page. 
However, the dim. marking (^\>) is flagged as "warning: unterminated 
decrescendo".  I can't find anywhere where I can place the \> and the \! to 
make the dim. show on the page and to avoid the error.  Advice gratefully 
received.

\clef treble
\key g\major
\time 4/4
\dimTextDim
<<
 {
   b'2^\>
 }\\
 {
   r4 \!  r4
 }
> >
<<
 {
   < b' d''>4
 }\\
 {
   < e' g'>8 a'8
 }
> >
<<
 {
   < c'' e''>4
 }\\
 {
   r4
 }
> >
\dimHairpin   |  % 1


--
Phil Holmes