Office Open XML

Not to be confused with OpenOffice.org XML or Microsoft Office XML formats.
Office Open XML
Office Open XML Document
Filename extension .docx, .docm
Internet media type application/vnd,
openxmlformats-officedocument,
wordprocessingml,
document[1]
Developed by Microsoft, Ecma, ISO/IEC
Type of format Document file format
Extended from XML, DOC, WordProcessingML
Standard(s) ECMA-376, ISO/IEC 29500
Website ECMA-376, ISO/IEC 29500:2008
Office Open XML Presentation
Filename extension .pptx, .pptm
Internet media type application/vnd,
openxmlformats-officedocument,
presentationml,
presentation[1]
Developed by Microsoft, Ecma, ISO/IEC
Type of format Presentation
Extended from XML, PPT
Standard(s) ECMA-376, ISO/IEC 29500
Website ECMA-376, ISO/IEC 29500:2008
Office Open XML Workbook
Filename extension .xlsx, .xlsm
Internet media type application/vnd,
openxmlformats-officedocument,
spreadsheetml,
sheet[1]
Developed by Microsoft, Ecma, ISO/IEC
Type of format Spreadsheet
Extended from XML, XLS, SpreadsheetML
Standard(s) ECMA-376, ISO/IEC 29500
Website ECMA-376, ISO/IEC 29500:2008

Office Open XML (also informally known as OOXML or OpenXML) is a zipped, XML-based file format developed by Microsoft[2] for representing spreadsheets, charts, presentations and word processing documents. The Office Open XML specification was initially standardised by Ecma (as ECMA-376) and later by ISO and IEC (as ISO/IEC 29500).

Starting with Microsoft Office 2007, the Office Open XML file formats have become the default[3] target file format of Microsoft Office,[4][5] although the Strict variant of the standard is not yet fully supported.[6] Microsoft Office 2010 provides read support for ECMA-376, read/write support for ISO/IEC 29500 Transitional, and read support for ISO/IEC 29500 Strict.[7] Microsoft has stated that the next release of Microsoft Office (version 15) will support both read and write of ISO/IEC 29500 Strict.[8]

Contents

Background

In 2000, Microsoft released an initial version of an XML-based format for Microsoft Excel, which was incorporated in Office XP. In 2002, a new file format for Microsoft Word followed.[9] The Excel and Word formats—known as the Microsoft Office XML formats—were later incorporated into the 2003 release of Microsoft Office.

Microsoft announced in November 2005 that it would co-sponsor standardization of the new version of their XML-based formats through Ecma International, as "Office Open XML".[10][11] The presentation was made to Ecma by Microsoft's Jean Paoli and Isabelle Valet-Harper.[12][13]

Standardization process

Main article: Standardization of Office Open XML

Microsoft submitted initial material to Ecma International Technical Committee TC45, where it was standardized to become ECMA-376, approved in December 2006.[14]

This standard was then fast-tracked in the Joint Technical Committee 1 of ISO and IEC. After initially failing to pass, an amended version of the format received the necessary votes for approval as an ISO/IEC Standard as the result of a JTC 1 fast tracking standardization process that concluded in April 2008.[15] The resulting four part International Standard (designated ISO/IEC 29500:2008) was published in November 2008[16] and can be downloaded from the ITTF.[17] A technically equivalent set of texts is published by Ecma as ECMA-376 Office Open XML File Formats — 2nd edition (December 2008); they can be downloaded from their web site.[18]

The ISO standardization of Office Open XML was controversial and embittered,[19] with much discussion both about the specification and about the standardization process.[20] According to InfoWorld:

“ OOXML was opposed by many on grounds it was unneeded, as software makers could use OpenDocument Format (ODF), a less complicated office software format that was already an international standard.[19] ”

The same InfoWorld article reported that IBM (which supports the ODF format) threatened to leave standards bodies that it said allow dominant corporations like Microsoft to wield undue influence. The article further says that Microsoft was accused of co-opting the standardization process by leaning on countries to ensure that it got enough votes at the ISO for Office Open XML to pass; although it does not specify exactly who accused Microsoft.[19]

Richard Stallman of the Free Software Foundation has stated that "Microsoft offers a gratis patent license for OOXML on terms which do not allow free implementations."[21]

Licensing

Under the Ecma International code of conduct in patent matters,[22] participating and approving member organisations of ECMA are required to make available their patent rights on a reasonable and non-discriminatory (RAND) basis.

Holders of patents which concern ISO/IEC International Standards may agree to a standardized license governing the terms under which such patents may be licensed, in accord with the ISO/IEC/ITU common patent policy.[23]

Microsoft, the main contributor to the standard, provided a Covenant Not to Sue[24] for its patent licensing. The covenant received a mixed reception, with some like the Groklaw blog criticizing it,[25] and others such as Lawrence Rosen, (an attorney and lecturer at Stanford Law School), endorsing it.[26]

Microsoft has added the format to their Open Specification Promise[27] in which

Microsoft irrevocably promises not to assert any Microsoft Necessary Claims against you for making, using, selling, offering for sale, importing or distributing any implementation to the extent it conforms to a Covered Specification […]

This is limited to applications which do not deviate from the ISO/IEC 29500:2008 or Ecma-376 standard and to parties that do not "file, maintain or voluntarily participate in a patent infringement lawsuit against a Microsoft implementation of such Covered Specification".[28][29] The Open Specification Promise was included in documents submitted to ISO/IEC in support of the ECMA-376 fast track submission.[30] Ecma International asserted that, "The OSP enables both open source and commercial software to implement [the specification]".[31]

Versions

The Office Open XML specification exists in a number of versions.

ECMA-376 1st edition (2006)

The ECMA standard is structured in five parts to meet the needs of different audiences.[18]

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 (OPC), for the package model and physical package, is defined and used by various document types in various applications from multiple vendors.
It defines core properties, thumbnails, digital signatures, and authorizations and encryption capabilities for parts or all the contents in the package.
XML schemas for the OPC are declared as XML Schema Definitions (XSD) and (non-normatively) using RELAX NG (ISO/IEC 19757-2)
Part 3. Primer
Informative (non-normative) introduction to WordprocessingML, SpreadsheetML, PresentationML, DrawingML, VML and Shared MLs, providing context and illustrating elements through examples and diagrams
Describes the custom XML data storing facility within a package to support integration with business data
Part 4. Markup Language Reference
Contains the reference material for WordprocessingML, SpreadsheetML, PresentationML, DrawingML, Shared MLs and Custom XML Schema, defining every element and attribute including the element hierarchy (parent/child relationships)
XML schemas for the markup languages are declared as XSD and (non-normatively) using RELAX NG
Defines the custom XML data storing facility
Part 5. Markup Compatibility and Extensibility
Describes extension facilities of OpenXML documents and specifies elements and attributes by which applications with different extensions can interoperate

ISO/IEC 29500:2008

The ISO/IEC standard is structured into four parts.[32] Parts 1, 2 and 3 are independent standards; for example Part 2, specifying Open Packaging Conventions, is used by other files formats including XPS and Design Web Format. Part 4 is to be read as a modification to Part 1, on which it depends.

A technically equivalent set of texts is also published by Ecma as ECMA-376 2nd edition (2008).

Part 1 (Fundamentals and Markup Language Reference)
This part has 5560 pages. It contains:
  • Conformance definitions
  • Reference material for the XML document markup languages defined by the Standard
  • XML schemas for the document markup languages declared using XSD and (non-normatively) RELAX NG
  • Defines the foreign markup facilities
Part 2 (Open Packaging Conventions)
This part has 129 pages. It contains:
  • A description of the Open Packaging Conventions (package model, physical package)
  • Core properties, thumbnails and digital signatures
  • XML schemas for the OPC are declared using XSD and (non-normatively) RELAX NG)
Part 3 (Markup Compatibility and Extensibility)
This part has 40 pages. It contains:
  • A description of extensions: elements and attributes which define mechanisms allowing applications to specify alternative means of negotiating content
  • Extensibility rules are expressed using NVDL
Part 4 (Transitional Migration Features)
This part has 1464 pages. It contains:
  • Legacy material such as compatibility settings and the graphics markup language VML
  • A list of syntactic differences between this text and ECMA-376 1st edition

The standard specifies two levels of document and application conformance, strict and transitional for each of WordprocessingML, PresentationML and SpreadsheetML. The standard also specifies applications descriptions of base and full.

Compatibility between versions

The intent of the changes from ECMA-376 1st edition to ISO/IEC 29500:2008 was that a valid ECMA-376 document would be a valid ISO 29500 "transitional" document,[33] but at least one change introduced at the BRM (refusing to allow further values for xsd:boolean) had the effect of breaking backwards compatibility for most documents.[34] A fix for this has been suggested to ISO/IEC JTC1/SC34/WG4, and was approved in June 2009 to go forward as a recommendation for the first amendment to Office Open XML.[35]

Applications able to read documents compliant to ECMA-376 edition 1 will regard ISO/IEC 29500-4 Transitional documents containing ISO 8601 dates as corrupt.[36]

File formats

Main article: Office Open XML file formats

The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. The format defines a set of XML markup vocabularies for word processing documents, spreadsheets and presentations as well as specific XML markup vocabularies for material such as mathematical formulae, graphics, bibliographies etc. The stated goal of the Office Open XML standard is to be capable of faithfully representing the pre-existing corpus of word-processing documents, spreadsheets and presentations that had been produced by the Microsoft Office applications and to facilitate extensibility and interoperability by enabling implementations by multiple vendors and on multiple platforms.

An Office Open XML file is a ZIP-compatible OPC package containing XML documents and other resources. That is, one can see the contents of an OOXML file, for example by renaming it to a .zip file and opening it with any zip tool. The actual .xml files can then be viewed in a web browser or a plain text editor.

Adoption

Several countries have formally announced either adoption, or the evaluation of adoption of Office Open XML. In some cases the Office Open XML standard has a national standard identifier; In some cases the Office Open XML standard is permitted to be used where national regulation says that non-proprietary formats must be used, in other cases, it means that some government body has actually decided that Office Open XML will be used in some specific context.

Australia
Australia's Department of Finance has released a desktop policy that required all agencies to adopt Office Open XML as the standard document format.[37]
Belgium
Belgium's Federal Public Service for Information and Communication Technology in 2006 was evaluating the adoption of the Office Open XML format. It already then confirmed that it would consider all ISO standards to be open standards, mentioning Office Open XML as such a possible future ISO standard.[38]
Denmark
In June 2007, the Danish Ministry of Science, Technology and Innovation recommended that beginning with January 1, 2008 public authorities must support at least one of the two word processing document formats Office Open XML or Open Document Format in all new IT solutions, where appropriate.[39]
Germany
In Germany the Office Open XML standard is currently under observation by the Federal Commissioner for Information Technology ("Die Beauftragte der Bundesregierung für Informationstechnik"). The latest release of "SAGA" (Standards and Architectures for E-Government-Applications) includes Office Open XML file formats in both its strict and transitional variant. The ISO/IEC 29500 standard may be used to exchange complex documents when further processing is required.[40]
Japan
On June 29, 2007, the government of Japan published a new interoperability framework which gives preference to the procurement of products that follow open standards.[41][42] On July 2 the government declared that they hold the view that formats like Office Open XML which organizations such as Ecma International and ISO had also approved was, according to them, an open standard.[43] Also, they said that it was one of the preferences, whether the format is open, to choose which software the government shall deploy.
Lithuania
Lithuanian Standards Board has adopted the ISO/IEC 29500:2008 Office Open XML format standard as Lithuanian National standard. The decision was made by Technical Committee 4 Information Technology on March 5, 2009. The proposal to adopt the Office Open XML format standard was submitted by Lithuanian Archives Department under the Government of the Republic of Lithuania.[44]
Norway
Norway's Ministry of Government Administration and Reform is evaluating the adoption of the Office Open XML format. The ministry put the document standard under observation in December 2007.[45]
Sweden
The Kingdom of Sweden has adopted Office Open XML as a 4 part Swedish National Standard SS-ISO/IEC 29500:2009.[46][47][48][49]
Switzerland
In July 2007, the Swiss Federal Council announced adherence SAGA.ch e-Government standards mandatory for its departments as well as for cantons, cities and municipalities. The latest version of SAGA.ch includes Office Open XML file formats.[50]
United Kingdom
The UK has put out an action plan for use of open standards, which includes ISO/IEC 29500 as one of several formats to be supported.[51][52]
United States of America
On April 15, 2009, the ANSI-accredited INCITS organisation voted to adopt ISO/IEC 29500:2008 as an American National Standard.[53]
The state of Massachusetts has been examining its options for implementing XML-based document processing. In early 2005, Eric Kriss, Secretary of Administration and Finance in Massachusetts, was the first government official in the United States to publicly connect open formats to a public policy purpose: "It is an overriding imperative of the American democratic system that we cannot have our public documents locked up in some kind of proprietary format, perhaps unreadable in the future, or subject to a proprietary system license that restricts access".[54] Since 2007 Massachusetts has classified Office Open XML as "Open Format" and has amended its approved technical standards list — the Enterprise Technical Reference Model (ETRM) — to include Office Open XML. Massachusetts, under heavy pressure from some vendors, now formally endorses Office Open XML formats for its public records.[55]

Application support

Main article: List of software that supports Office Open XML

Some older versions of Microsoft Word and Microsoft Office are able to read and write docx files after installation of the free compatibility pack provided by Microsoft,[56] but some items such as equations are converted into images that cannot be edited.[57]

Starting with Microsoft Office 2007, the Office Open XML file formats have become the default[3] file format of Microsoft Office.[4][5] However, due to the changes introduced in the Office Open XML standard, Office 2007 is not entirely in compliance with ISO/IEC 29500:2008.[58][59][60][61] Microsoft Office 2010 includes support for the ISO/IEC 29500:2008 compliant version of Office Open XML,[59] but it can only save documents conforming to the transitional schemas of the specification, not the strict schemas.[6][62] Note that the intent of the ISO/IEC is to allow the removal of the transitional variant from the ISO/IEC 29500 standard.[62]

The ability to read and write Office Open XML format is however not limited to Microsoft Office; other office products are also able to read and write this format. SoftMaker Office 2010 is able to read and write .DOCX and .XLSX files in its word processor and spreadsheet applications. OpenOffice.org from version 3.0 has been able to import Office Open XML files.[63][64] Version 3.2 improves this feature with read/write support even for password-protected Office Open XML files.[65] KOffice version 2.2 and later is able to import Office Open XML files. Other office products that offer import support for the Office Open XML formats include TextEdit (included with Mac OS X), iWork, IBM Lotus Notes, WordPerfect, Kingsoft Office and Google Docs.

See also

References

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