Linked by Thom Holwerda on Wed 2nd Apr 2008 17:54 UTC, submitted by Almafeta

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An ISO standard doesn't prevent "undocumented extensions", as you call them. ISO standards just require *documented* features will be compliant.
You cannot prevent any company to add its own extensions to a format in order to support features others don't support and what standard didn't include. If formats are open and smart, they will include a way to add custom extensions without the need to mess with data.
The important thing is they don't introduce any incompatibility regarding the standard part of the specs. As I said, I don't believe they will just because now that's not in their interests.
Member since:
2007-03-06
MSOffice 2007 docx format adds undocumented extensions to the Ecma 376 OOXML. As such I don't think it can really be considered compliant, let alone being a reference implementation (which leaves us with 0 of those).