The following is the Open Document Format ODF standard ISO/IEC 26300:2006. It is obtained from the ISO standards store at www.iso.ch. It reflects the published ISO/IEC standard. It reflects the ODF standard as amended after the PAS ballot in ISO/IEC, and is also called OASIS ODF v1.0 2nd edition.
I am a member of ISO/IEC JTC 1/SC34 and I was involved in having SC34 asking OASIS to propose ODF as an ISO standard, so as the copyright notices of the standard allows it, the standard is hereby available here.
The standard is available in 3 formats: ODT, HTML and PDF.