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.tex file checkins for credit at meeting and review if anybody wants to.

The spreadsheet determines which data it imports from the metadata of
the resource. Additional imported values can be used in formulas
through the same \&EXT (external) function that is also available in
assessments. For example, \&EXT("system.time") imports the system
time. (Note that in this particular example, the explicit time
dependence is not recognized by the caching mechanism (see also
\ref{Spreadsheet_Completely_Recalc}).