Microsoft has won approval for its Office Open XML document format from international standards body ECMA International.

ECMA's General Assembly voted 20-1 in favor of the standard at a meeting in Zurich on Thursday afternoon, and will now submit the format to the International Organization for Standardization (ISO) for its approval. The single vote against came from a representative of IBM.

A standardized document format will make it easier for competing software companies to develop products that can interoperate with one another and to edit the same documents. Products meeting the standard could find favor with governments, or other organizations concerned about interoperability.

Interoperability is vital for the preservation of archive information, according to Adam Farquhar, head of e-architecture at the British Library and a member of the committee that worked on the standard at ECMA. The British Library archives electronic documents, but must deal with whatever format they arrive in. The development of interoperable software tools will make that work easier.

"The level of precision in this standard is unprecedented," Farquhar said. The standard runs to several thousand pages.

To help developers digest the standard, the committee has published a 14-page white paper explaining it.

"The committee put a lot of effort into making the document accessible," Farquhar said.

That accessibility is important if Microsoft is to win developers over to its document format, as the company faces competition in the standards industry just as it does in the software market.

A rival document format, OpenDocument Format (ODF), has already won approval from ISO, and was published as an ISO standard last month. ODF is used by office productivity suites such as OpenOffice.org or Sun's StarOffice, and has gained the support of other companies, including IBM. Government officials in France and the commonwealth of Massachusetts in the United States have recommended adoption of ODF as a government standard.

ISO approval "is a critical factor for governments," said Marino Marcich, Managing Director of the ODF Alliance, a body that promotes the OpenDocument Format.

Microsoft's general manager for interoperability and XML architecture, Jean Paoli, agrees that "some public institutions prefer standards that are ISO-certified."

The IDG News Service is a Network World affiliate.

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