[BioC] Some question reg golubTrain data

[dibakar ray]

I am new to both R and Bioconductor. I was going through available 
documentation and found the data set golubTrain. It contains ALL AML data 
set og Golub et al.(1999).
After close examination I found this object contains not only the ALL AML 
expression data (original file data_set_ALL_AML_train.txt )  information on 
RNA samples (original file table_ALL_AML_samples.txt
) and some other information.
I was wandering, how these type of objects, which contain information from 
multiple sources are generated from original data files.
Thanks
Dibakar Ray