(map learningmap-d) learningGroup introduces and groups learning objects into higher-level organizations, such as course-level, module-level, or lesson-level. learningObject organizes topic references to DITA learning topics as a learning object. Use a learningPlanRef element to include a topic reference to a learning plan topic as part of a learningObject. Use a learningOverviewRef element to include a topic reference to a learning overview topic as part of a learningObject. Use a learningSummaryRef to include topic reference to a learning summary topic in a DITA learning object. Use a learningContentRef element to include a topic reference to a learning content topic as part of a DITA learningObject. Use a learningPreAssessmentRef element to include a topic reference to a learning assessment topic as part of a DITA learningObject. Use a learningPostAssessmentRef element to include a topic reference to a learning assessment topic as part of a DITA learningObject.