The document discusses Information for Learning Object eXchange (ILOX), which uses the Functional Requirements for Bibliographic Records (FRBR) conceptual model to describe learning objects at different levels of abstraction (Work, Expression, Manifestation, Item). It provides examples of metadata that could be used at each FRBR level and discusses best practices for selecting the appropriate level and metadata when describing learning objects in different contexts like harvesting, searching, and publishing. ILOX is compared to the Open Archives Initiative Object Reuse and Exchange (OAI-ORE) standard, noting they are orthogonal and can be combined.