Office Open XML specification exists in several versions.

ECMA-376 1st edition (2006)

The ECMA standard is structured in five parts to meet the needs of different audiences.;;Part 1. Fundamentals
:* Vocabulary, notational conventions and abbreviations
:* Summary of primary and supporting markup languages
:* Conformance conditions and interoperability guidelines
:* Constraints within the Open Packaging Conventions that apply to each document type;;Part 2. Open Packaging Conventions
:* The Open Packaging Conventions

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