The LOR system can be understood as a MAM system.
Learning Objects Repository – are Digital Libraries with educational content.
The main purpose of these repositories is to manage and share didactic content and facilitate its use for the purpose of educating and teaching.
Media Portal can act as an advanced LOR system, in addition to managing the digital library, it also aggregates metadata such as Learning Object Metadata (LOM).
Learning Object Metadata (LOM), is the standard set of metadata ideal for indexing and cataloging contents of this digital library.