where does one find the def for the db question object/class?

Re: where does one find the def for the db question object/class?

{$a->নাম} - {$a->তারিখ} দ্বারা
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There is no $question class. The $question variable is just a data structure. The question type classes are singleton objects - that is, there is one object for each question type, not one per question.

Is the documentation you are thinking of http://docs.moodle.org/en/Development:Quiz_database_structure