How can I obtain the data stored in variables of Calc ?

[leo2013]

There are two cases which I meet normally. 
One is creating one or more new data-sheets in one workbook, and then fill
some data into the cells of these data-sheets; the other is opening one
*.xlsx (or *.xls,*.slsm,*.xls) file with a amount of data which have been in
data-sheets of this file already.
My question: Which structures from source codes will the data be stored in
on the two cases separately ?



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