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A Root class has been written to query the database to find requested files and create a TChain of them. These are in cvs at
http://www-glast.stanford.edu/cgi-bin/viewcvs/users/richard/pipelineDatasets/#dirlist
bash-2.05b$ source /nfs/farm/g/glast/u13/MC-tasks/utilities/setupOracleRoot.sh
bash-2.05b$ root -l
root 0 .L /nfs/farm/g/glast/u13/MC-tasks/utilities/pipelineDatasets/v0/rh9_gcc32/libpipelineDatasets.so
root 1 pipelineDatasets* p = new pipelineDatasets();
root 2 int sc = p->selectDatasets("allGamma-GR-HEAD1.403","merit");
root 3 TChain* c = p->makeChain("MeritTuple");
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