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The line "HullForm$" "" in the script tells the system that at least a DETERMINED value a DETERMINED value of HullForm$ should be available to allow selection of a case. This means, that the result of the selection cannot be empty values for HullForm$, therefor Quaestor will pre-filter all these cases out of the total dataset. The selection of HULLDATA# will contain all other DETERMINEDvalues other DETERMINEDvalues available in the selected record. Also SHIPTYPE$, PROJECT$ and CONDITION$ should be DETERMINED be DETERMINED (thus available) to allow a selection.
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This will also work for a larger number of selection keys of which any key with a DETERMINED value a DETERMINED value will not be presented in the selection dialog and are used as query arguments for the following sub selection. This is the way in which you can navigate and select in large collections of coherent options. An example is the QSTAP knowledge system for ship sea trial analysis in which a large number of ship- and condition dependent methods are to be selected from.
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