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These are defined in clause 17.5 of Part 1.
== File formats ==
{{main|Office Open XML file formats}}
The Office Open XML file formats are a set of [[file format]]s that can be used to represent electronic [[Office suite|office]] documents. There are formats for [[word processing]] documents, [[spreadsheets]] and [[presentations]] as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc.
== Compatibility settings ==
Versions of Office Open XML contain what are termed "compatibility settings". These are contained in Part 4 ("Markup Language Reference") of ECMA-376 1st Edition, but during standardization were moved to become a new part (also called Part 4) of ISO/IEC 29500:2008 ("Transitional Migration Features").
These settings (including element with names such as ''autoSpaceLikeWord95'', ''footnoteLayoutLikeWW8'', ''lineWrapLikeWord6'', ''mwSmallCaps'', ''shapeLayoutLikeWW8'', ''suppressTopSpacingWP'', ''truncateFontHeightsLikeWP6'', ''uiCompat97To2003'', ''useWord2002TableStyleRules'', ''useWord97LineBreakRules'', ''wpJustification'' and ''wpSpaceWidth'') were the focus of some controversy during the standardisation of DIS 29500.<ref>{{ cite web | url=http://www.freesoftwaremagazine.com/articles/odf_ooxml_technical_white_paper?page=0%2C9 | title=ODF/OOXML technical white paper — A white paper based on a technical comparison between the ODF and OOXML formats | publisher=Free Software Magazine}}</ref> As a result, new text was added to ISO/IEC 29500 to document them.<ref>{{ cite web | url = http://www.ecma-international.org/publications/standards/Ecma-376.htm | title = ECMA-376 2nd edition Part 4 (paragraph 9.7.3) | publisher = Ecma-international.org | date = | accessdate = 2009-09-16 }}</ref>
An article in [[Free Software Magazine]] has criticized the markup used for these settings. Office Open XML uses distinctly named elements for each compatibility setting, each of which is declared in the schema. The repertoire of settings is thus limited — for new compatibility settings to be added, new elements may need to be declared, "potentially creating thousands of them, each having nothing to do with interoperability".<ref>{{ cite web | quote="... OOXML chose this route. Rather than create an application-definable configuration tag there is a unique tag for each setting ... Currently, the only application's unique settings that are catered for are the applications that the standard's authors have decided to include, ... For other applications to be added, further tag names would need to be defined in the specification, potentially creating thousands of them, each having nothing to do with interoperability ..". | url=http://www.freesoftwaremagazine.com/articles/odf_ooxml_technical_white_paper?page=0%2C7 | title=ODF/OOXML technical white paper — A white paper based on a technical comparison between the ODF and OOXML formats | publisher=Free Software Magazine }}</ref>
== Extensibility ==
The standard provides two types of extensibility mechanism, Markup Compatibility and Extensibility (MCE) defined in Part 3 (ISO/IEC 29500-3:2008) and Extension Lists defined in clause 18.2.10 of Part 1.
==References==
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