ISO/IEC 19773:2011 specifies small modules of data that can be used or reused in applications. These modules have been extracted from ISO/IEC 11179-3, ISO/IEC 19763, and OASIS EBXML, and have been refined further. These modules are intended to harmonize with current and future versions of the ISO/IEC 11179 series and the ISO/IEC 19763 series. These modules include: reference-or-literal (reflit) for on-demand choices of pointers or data, multitext, multistring, etc. for recording internationalized and localized data within the same structure, slots and slot arrays for standardized extensible data structures, internationalized contact data, including UPU postal addresses, ITU-T E.164 phone numbers, internet E-mail addresses, etc., generalized model for context data based upon who-what-where-when-why-how (W5H), data structures for reified relationships and entity-person-groups. Conformity can be selected on a per-module basis.