R help - Jun 2004 - models for compositional data by J. Aitchison

Hi,
is there any R software for model building with data of the compositional
data type:
The statistical analysis of compositional data" by J. Aitchison.

thanks

***********************************************************
Matthias Schmidt
Forstliche Versuchs- und Forschungsanstalt Baden-W??rttemberg (FVA) 
Abteilung Biometrie und Informatik
Wonnhaldestr. 4
79100 Freiburg i. Br
Tel.: + 49 (0)761 / 4018 -187
Fax: + 49 (0)761 / 4018 - 333