The student assignment object returned by Tabula has the following properties:

id	A unique identifier for the assignment
academicYear	A string representation of the academic year in yy/yy format, e.g. 13/14
name	The name of the assignment
studentUrl	The URL that a student would go to to submit the assignment or receive feedback
module	A JSON object with two properties: code with the short-form module code and name with the module name
hasSubmission	true if the student has submitted to the assignment, false otherwise
hasFeedback	true if feedback/marks have been returned to the student, false otherwise
hasExtension	true if the student has requested or been granted an extension, false otherwise
hasActiveExtension	true if the student has a currently active extension, false otherwise
extended	true if the deadline has been extended for this student and they are currently in that extension period, false otherwise
extensionRequested	true if the student has requested an extension that hasn't been granted, false otherwise
submittable	true if the assignment is currently accepting submissions, false otherwise
resubmittable	true if the assignment currently accepts resubmissions, false otherwise
summative	true if the assignment is summative, false if it is formative
late	true if the student is not in an extension period and the assignment is closed, false otherwise
allowLateSubmissions	true if late submission is allowed for students who have not previously submitted, false otherwise
allowResubmission	true if students are allowed to resubmit up to the deadline, false otherwise
allowExtensions	true if students are allowed to request extensions (and the department allows it), false otherwise
fileAttachmentLimit	The maximum number of attachments a student can submit. Must be 1 or more
fileAttachmentTypes	An array of strings containing file extensions that students are allowed to submit. If empty, students can submit any file
submissionFormText	Text displayed to students when submitting
wordCountMin	The minimum word count a student must declare to be able to submit, or null if word counts aren't required or there is no lower limit
wordCountMax	The maximum word count a student must declare to be able to submit, or null if word counts aren't required or there is no upper limit
wordCountConventions	Text displayed to student when they submit their word count
openEnded	true if the assignment has no close date, false otherwise
opened	true if the assignment's open date has passed, false otherwise
closed	true if the assignment's close date has passed, false otherwise
openDate	The open date of the assignment in ISO date-time format
closeDate	The close date of the assignment in ISO date-time format
submission	A student assignment submission object or null if there is no submission
feedback	A student assignment feedback object or null if there is no feedback
extension	A student assignment extension object or null if there is no extension

The StudentAssignmentSubmission object

id	A unique identifier for the submission - this is used for submission receipts
late	true if the submission was late, false otherwise
authorisedLate	true if the submission was late but within an extension period, false otherwise
attachments	An array of JSON objects with two properties, id with a unique identifier and filename
submittedDate	The submitted date in ISO date-time format
closeDate	The close date of the assignment in ISO date-time format
wordCount	The declared word count of the submission, or null

The StudentAssignmentFeedback object

id	A unique identifier for the feedback
mark	The given mark for the feedback, or null
grade	The given grade for the feedback, or null
adjustments	An array of adjustments applied to the submission, including reason and comments
genericFeedback	Feedback given to anybody who submitted to the assignment
comments	Feedback given specifically to this student
attachments	An array of JSON objects with two properties, id with a unique identifier and filename
downloadZip	The URL that a student would go to to download all feedback attachments
downloadPdf	The URL that a student would go to to download a PDF version of the feedback