This standard specifies a conceptual data schema that defines the structure of a metadata instance for a learning object. For this standard, a learning object is defined as any entity, digital or non-digital, that is used for learning, education or training. For this standard, a metadata instance for a learning object describes relevant characteristics of the learning object to which it applies. Such characteristics can be regrouped in general, life cycle, meta-metadata, educational, technical, educational, rights, relation, annotation, and classification categories. The conceptual data schema specified in this standard will allow for linguistic diversity of learning objects and the metadata instances that describe them. The conceptual data schema defined in this standard specifies the data elements of which a metadata instance for a learning object is composed. This standard will be referenced by other standards that will define the implementation descriptions of the data schema so that a metadata instance for a learning object can be used by a learning technology system to manage, locate, evaluate, or exchange learning objects. This standard does not define how a learning technology system will represent or use a metadata instance for a learning object.