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The [[W3C XML Schema|XML Schema]] of Office Open XML emphasizes reducing load time and improving [[parsing]] speed.<ref>{{Cite web| title=Software Developer uses Office Open XML to Minimize File Space, Increase Interoperability| url=http://www.openxmlcommunity.org/documents/casestudies/Intellisafe_OpenXML_Final.pdf
The naming of elements and attributes within the text has attracted some criticism. There are three different syntaxes in OOXML (ECMA-376) for specifying the color and alignment of text depending on whether the document is a text, spreadsheet, or presentation. Rob Weir (an [[IBM]] employee and co-chair of the [[OASIS (organization)|OASIS]] [[OpenDocument Format]] TC) asks "What is the engineering justification for this horror?". He contrasts with [[OpenDocument]]: "ODF uses the W3C's XSL-FO vocabulary for text styling, and uses this vocabulary consistently".<ref>{{ cite web | url=http://www.robweir.com/blog/2008/03/disharmony-of-ooxml.html | title= Disharmony of OOXML | author=Rob Weir | date=14 March 2008}}</ref>
Some have argued the design is based too closely on Microsoft applications.
In August 2007, the [[Linux Foundation]] published a blog post calling upon ISO National Bodies to vote "No, with comments" during the International Standardization of OOXML. It said, "OOXML is a direct port of a single vendor's binary document formats. It avoids the re-use of relevant existing international standards (e.g. several cryptographic algorithms, VML, etc.). There are literally hundreds of technical flaws that should be addressed before standardizing OOXML including continued use of binary code tied to platform specific features, propagating bugs in MS-Office into the standard, proprietary units, references to proprietary/confidential tags, unclear [[Intellectual property|IP]] and patent rights, and much more".<ref>{{
The version of the standard submitted to [[ISO/IEC JTC 1|JTC 1]] was 6546 pages long. The need and appropriateness of such length has been questioned.<ref name="GooglesPositiononOOXML">{{ cite web | url = http://www.odfalliance.org/resources/Google%20OOXML%20Q%20%20A.pdf | title = Google's Position on OOXML as a Proposed ISO Standard | date = February 2008 | publisher = [[Google]] | quote = If ISO were to give OOXML with its 6546 pages the same level of review that other standards have seen, it would take 18 years (6576 days for 6546 pages) to achieve comparable levels of review to the existing ODF standard (871 days for 867 pages) which achieves the same purpose and is thus a good comparison. Considering that OOXML has only received about 5.5% of the review that comparable standards have undergone, reports about inconsistencies, contradictions and missing information are hardly surprising | url-status = dead | archive-url = https://web.archive.org/web/20100818112807/http://www.odfalliance.org/resources/Google%20OOXML%20Q%20%20A.pdf | archive-date = 2010-08-18 }}</ref><ref>{{ cite web | url = http://www.ibm.com/developerworks/library/x-ooxmlstandard.html | title = OOXML: What's the big deal? | date = 2008-02-19 | publisher = [[IBM]] | url-status = dead | archive-url = https://web.archive.org/web/20091003044227/http://www.ibm.com/developerworks/library/x-ooxmlstandard.html | archive-date = 2009-10-03 }}</ref> [[Google]] stated that "the ODF standard, which achieves the same goal, is only 867 pages"<ref name="GooglesPositiononOOXML"/>
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=== Office MathML (OMML) ===
Office Math Markup Language is a mathematical markup language which can be embedded in WordprocessingML, with intrinsic support for including word processing markup like revision markings,<ref>{{cite web|url = http://idippedut.dk/post/Do-your-math-OOXML-and-OMML|title = Do your math - OOXML and OMML (Updated 2008-02-12)|author = Jesper Lund Stocholm|publisher = A Mooh Point blog|date = 2008-02-12|access-date = 2015-11-18|archive-date = 2016-03-26|archive-url = https://web.archive.org/web/20160326225935/http://idippedut.dk/post/Do-your-math-OOXML-and-OMML|url-status = dead}}</ref> footnotes, comments, images and elaborate formatting and styles.<ref>{{cite web| url=http://blogs.msdn.com/murrays/archive/2007/06/05/science-and-nature-have-difficulties-with-word-2007-mathematics.aspx| title=Science and Nature have difficulties with Word 2007 mathematics| author=Murray Sargent| publisher=MSDN blogs| date=2007-06-05| access-date=2007-07-31}}</ref>
The OMML format is different from the [[World Wide Web Consortium]] (W3C) [[MathML]] recommendation that does not support those office features, but is partially compatible<ref>{{cite web| url=
The following Office MathML example defines the [[fraction (mathematics)|fraction]]: <math>\frac{\pi}{2}</math>
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