The Sharable Courseware Object Reference Model (SCORM) is very prominent in the marketing literature of a lot of content management vendors. To hear these vendors talk, if your XML is not SCORM compliant, there is something wrong with you. SCORM is a set of standards, implemented in XML, which passes instructions to a Learning Management System (LMS). It is analogous to an application program interface (API)6.
If your organization selects a SCORM-compliant LMS, then your repository should contain an XSLT to present your content with additional SCORM elements that enable the LMS to know how to deal with it. The nice part about SCORM is that it is an open standard. If you decide that this LMS does not meet your needs, you will be able to select another SCORM-compliant LMS7 and only have to tweak your repository here and there to make it all work correctly.