xsd files in SCORM package

I have been asking colleagues but have not gotten a straight answer. What are the following files for and do they interact with the LMS in a SCORM package?adlcp_rootv1p2.xsdims_xml.xsdimscp_rootv1p1p2.xsdimsmd_rootv1p2p1.xsdAre they required by SCORM compliant LMS's?Thank you,Simon

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