[xblock.v1]
_annotatable_extracted = xblocks_contrib:AnnotatableBlock
_discussion_extracted = xblocks_contrib:DiscussionXBlock
_html_extracted = xblocks_contrib:HtmlBlock
_lti_extracted = xblocks_contrib:LTIBlock
_poll_question_extracted = xblocks_contrib:PollBlock
_problem_extracted = xblocks_contrib:ProblemBlock
_video_extracted = xblocks_contrib:VideoBlock
_word_cloud_extracted = xblocks_contrib:WordCloudBlock
