### create a simple DFIobj
DF <- data.frame(Foo=c(3,5,7,1,5,8,7,10),
Bar=c("A","B","B","C","B","B","C","A"),
Baz=c(TRUE,FALSE),
stringsAsFactors=FALSE)
DFIobj <- DFI(DF, c("Foo","Bar")) # create a DFI from DF with indexes on "Foo" and "Bar" columns
### get the indexes names (returns c("Foo","Bar"))
DFI.indexes(DFIobj)
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