Remapping German sharp s (Eszett)

I assume mine is a general problem with remapping, but what I want to do
is to use, with Linux Libertine (and XeLaTeX), the round (ligature ss)
form of German sharp s (E04C) instead of the standard form (00DF).

I thought this could be done by adding

  > U+00DF <> U+E04C

to my tex-text.map.

This does not seem to work however.  Compiling


  > \documentclass{minimal}
  > \usepackage{xltxtra}
  > \setmainfont[Mapping=tex-text]{Linux Libertine O}
  > \begin{document}
  > Lessingstraße
  > \end{document}

with XeLaTeX still gives me 00DF in ``Lessingstra_ß_e''.

Can someone please tell me what I am missing here?

Thanks in advance,

Rainer
-- 
Prof. Dr. Rainer Thiel
Institut für Altertumswissenschaften
07737 Jena, Germany (EU)
[email protected]

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