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Frequently, it is desirable to get responses, which are of a certain type or format. For instance, you might want a binary choice (yes or no), or to ask for the response to a true/false question, or to ask someone's gender (male/female). This kind of item asks for a specific response, such as 'Y' or 'N' or 'T' or 'F.'
<explicit> <text [question text]> <valid a/b/c/d> </explicit>
The following are the components of the explicit response question:
The <explicit> is the keyword for the explicit response question.
The <text [text] > is for the text question. The question text is placed after the keyword in brackets.
<valid c1/c2/c3/c4> Place the valid choices separated by forward slashes.
</explicit> Closes the markup.
<explicit> <text Are you older than 21?> <valid Yes/No> </explicit>
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