flex Expert System Toolkit - LPIS

7. Knowledge Specification Language 100
Questions
Menu Questions
flex toolkit
A question describes the manner in which some information is to be
extracted from the user. The response is obtained either through one of
flex’s standard answer mechanisms or a customized answer.
A standard question comprises a question name, followed by some text to
be displayed, followed by the type of question and an optional explanation
indicated by the KSL keyword because.
In a menu question, the user is presented with a collection of options, and is
offered the choice of making either a single selection or multiple selections.
The general formats of a menu question are as follows.
question question_name
text of question ;
choose from menu items ;
because explanation .
question question_name
text of question ;
choose some of menu items .
question question_name
text of question ;
choose one of menu items .
An explanation (the because part) is optional in each case.
The KSL keywords choose one of are for single selection menus, where
the user must select just one item; the others are for multiple selection
menus where the user can select any number of items.
The user’s response to the question is stored in a global variable called
question_name.
Examples
question choose_a_colour
Select a colour ;
choose one of red, green, yellow, blue, black,
white .
The text Select a colour will be displayed when the question is asked.
In this case the user may select just one of the items displayed, and this
selection will be stored as the current value of the global variable
choose_a_colour.
In the following example the user may select any number of the items