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I'm creating an app to convert Vimeo Showcases into Canvas quizzes. I'm ready to try exporting the list of json files to the qti format. I've seen example qti format files and can get the json file MOSTLY exported to the right format, but I can't figure out how to set assessment identifier and item identifier codes. Where do those come from? I assume they are used to prevent two assessments having the same code, but what is the method used to set those?

Here are some example identifiers I got from the Kansas State qti converter:

<fieldlabel>assessment_question_identifierref</fieldlabel>
<fieldentry>if29e0b74848f7755e6706cd2b06f2038</fieldentry