Meta-data about a structure or substructure within this instance. Calandar Date. SO8601 date/time entry. extension extension extension The data value for the declared field Typing information for field name vocabulary. Identifier The record unique reference mechanism. Privacy categories A container for the privacy information. Something produced by the learner. Globally unique and record unique referencing mechanism. Source of an adjacent element's contents An identification provided by a specified source. Presumed, but not required, to be unique. State or progress. Time meta-data e.g. expiry date of the information. The container for the temporal information. A vocabulary term from a defined vocabulary. The source of a vocabulary's term. The vocabulary value term.