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Question
========
A Question object is guaranteed to have the following behavior:
- When initially created stores None as `response` and `submitted` is False.
- Whenever response is updated, the `correct` property is set to the credit
earned for the question (often actually set to True=1 and False=0, though
partial credit is possible).
- The `text` attribute of a question is the data object to be presented to
the user, along with possible answers, if any are given. The `text` and
`answers` fields will contain an object that can be passed to some subset
of the markup/media-type conversion functions to produce a value of the
appropriate type. (It is not recommended that you test types directly,
instead use the functions provided for this purpose).
- A `title` attribute will *always* be present on the object, though it may
be None.
- Some question types may have additional information required to present
them correctly. It is recommended that generic functions, with
appropriate error handling, be used for rendering questions to the user.
(Generic functions are already used internally by the question API, so
the PEAK-Rules implementation is already available to users of the API).
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