This function issues repeatedly a series of questions onto the screen and from the answers builds a data.frame.
A named list describing the different variables of the data frame to produce. Its names give the names of the variables. Each component of def are the list of arguments to provide to function inquiry to get the values for each individual. More precisely question which is compulsory, help (default NULL), a7type (compulsory either numeric or character), a7possibilities (default NULL).
Questions are proposed with the function inquiry. Activating the 'stop' in any of the questions is interpreted as the end of the data capture.
The resulting data frame, possibly with zero row when no individual was correctly recorded.
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