This document is not listed as part of the Ecma 376 standard in the Foreword to Part I "Fundamentals" and its status whether informative or normative is not explicitly stated.

Clarify the status of this Overview document. If it is merely a promotional whitepaper about Ecma 376, then it should not be included in the published standard.

Foreword
Part 1

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Proposed Disposition of DIS 29500 Comment IN-0050 (Modified: 2007-10-27) The document “Office Open XML Overview” was intended to provide some background and contextual information about OOXML for reviewers during both the Ecma adoption stage and the 5-month Ballot stage of the Fast-Track process. (Such a document is often referred to as a white paper.) As such, this document will not be included in the published standard. Similar Comments: CA-0002 , DE-0140 , DK-0043 , GB-0004 , GB-0006 , GB-0007 , GB-0008 , GB-0009 , GB-0010 , GB-0011 , GB- 0015 , JP-0018 , PT-0002 , US-0004