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Bug #2281: need to escape stuff!

\label{Spreadsheet_Files}

If you have permission to edit a spreadsheet you will also have permission to
save and load spreadsheet definition files.  

\textbf{Default Spreadsheets}

There are three default spreadsheets, one for each level.  These are called
\texttt{default\_classcalc}, \texttt{default\_studentcalc}, and 
\texttt{default\_assesscalc}.
These are the starting spreadsheets for every class. 

\textbf{Modified Spreadsheets}

When you modify a spreadsheet you begin working with an temporary copy.  
You may save the spreadsheet using the ``Save as'' 
button on the spreadsheet.  Fill in a name and click on the ``Save as'' button.
You may also use the ``Save as \& Make This Sheet the Default'' button
to set the current spreadsheet definition as the default for this level.

\textbf{Loading a Spreadsheet Definition from a Published File}

Using the ``Select Spreadsheet File'' link opens the LON-CAPA resource browser.
Only files with the extension \texttt{spreadsheet} can be selected.  The
spreadsheet definition file must be valid XML.  Please contact the LON-CAPA
development team for instructions and examples on creating these files.

\textbf{Setting the Assessment Level Spreadsheets used to Calculate Grades}

In the student level spreadsheet every assessment in the course has a 
spreadsheet definition file associated with it.  
The spreadsheet definition used for each assessment
is selected using a drop-down dialog in the assessments row.
Initially this spreadsheet is ``Default'', meaning the current default 
assessment spreadsheet will be used to compute the students grade.

Changing the spreadsheet used for an assessment modifies the student level 
spreadsheet, so you must use the ``Save as'' button to save the current
student spreadsheet.