The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments and errata) applies.

OPC 10000-1, OPC Unified Architecture - Part 1: Overview and Concepts

OPC 10000-4, OPC Unified Architecture - Part 4: Services

OPC 10000-5, OPC Unified Architecture - Part 5: Information Model

OPC 10000-6, OPC Unified Architecture - Part 6: Mappings

OPC 10000-8, OPC Unified Architecture - Part 8: Data Access

OPC 10000-11, OPC Unified Architecture - Part 11: Historical Access

OPC 10000-18, OPC Unified Architecture - Part 18: Role-Based Security

OPC 10000-21, OPC Unified Architecture - Part 21: Device Onboarding

ISO 639 (all parts), Codes for the representation of names of languages

ISO 3166 (all parts), Codes for the representation of names of countries and their subdivisions

ISO/IEC/IEEE 60559:2011, Information technology – Microprocessor Systems – Floating-Point arithmetic

IETF RFC 5646, Tags for Identifying Languages

ISO 8601-1:2019, Date and time – Representations for information interchange – Part 1: Basic

Unicode Annex15, Unicode Standard Annex #15: Unicode Normalization Forms

W3C XML Schema Definition Language (XSD) Part 2, DataTypes

ISO 4217, Codes for the representation of currencies

RFC 3986, Uniform Resource Identifier (URI): Generic Syntax:

RFC 4151, The 'tag' URI Scheme

Unicode C0 Controls and Basic Latin:

Unicode C1 Controls and Latin-1 Supplement: