Through an amount of mandatory elements eLML ensures that at least the minimal metadata elements are filled out even though many authors do not like to fill in metadata information. The eLML metadata elements are a subset of the IMS Learning object metadata (LOM) that can be used to store data about the length of the lessons, the author(s), copyrights, the required knowledge to attempt this lesson and the basic technical requirements. The bibliography style elements and the metadata section are defined in a separate XML schema and thus can be replaced by other standards or definitions.