multiple headers

[Jean-marc LEGRAND]

Hi list !

I'm using Lily 2.0.1 on WinXP.

I've structured a four parts piece same as the orchestral example in Lilypond 
book, so that I can
extract parts very easely.
The problem is that the whole piece is divided into several pieces which has 
each a name.

My script has this shape :



\header {
      title =     "MESSE POUR LES INSTRUMENTS"
      subtitle = "au lieu des orgues"
      opus =  "H. 513"
      composer = "Marc-Antoine CHARPENTIER (1643-1704)"
      }

dessusI =
      \notes
      \relative c''' {
            \property Staff.TimeSignature \set #'style = #'1style
            \time 2/2
            \key c \major
                  \clef "petrucci_g"
                  \property Voice.Script \set #'padding = #1
a2 e4 fis
(...)
\bar "|."
                  }
%%%%%%%%%%%%%%
dessusII =
      \notes
      \relative c'' {
            \property Staff.TimeSignature \set #'style = #'1style
            \time 2/2
            \key c \major
                  \clef "petrucci_g"
 c4 b a2
(...)
                  }


%%%%%%%%%%%%%%%
taille =
      \notes
      \relative c' {
            \property Staff.TimeSignature \set #'style = #'1style
            \time 2/2
            \key c \major
                  \clef "petrucci_c3"

e4 d c2
(...)

            }

%%%%%%%%%%%%%%%%%
basse =
      \notes
      \relative c' {
            \property Staff.TimeSignature \set #'style = #'1style
            \time 2/2
            \key c \major
                         \clef "petrucci_f"

a1  (...)

            }
%%%%%%%%%%%%%%%%%

\score      {
            \context StaffGroup ="tutti"
                  <<
                  \context Staff ="1er_dessus" \dessusI
                  \context Staff ="2ème_dessus" \dessusII
                  \context Staff ="taille" \taille
                  \context Staff ="basse" \basse
                  >>

          }




If I put another header bloc in the \note bloc, it doesn't take in account the 
major header bloc.

My questions is :

How and where do I put the different \header {piece=.....} blocks, so that they 
also appear when I
extract parts ?

Thanks a lot and best regards !