Difference on ACCRINT?

Hello,

Compiling yet another comparison.

Can anyone enlighten me on the difference between the OpenFormula 
definition of ACCRINT and ACCRINT as defined by ISO 29500, 18.17.7.2?

(I am aware that in ISO 29500 the syntax uses the term "rate" where 
OpenFormula uses "coupon" but that isn't a significant difference.)

Hope everyone is enjoying the holiday season!

Patrick

-- 
Patrick Durusau

Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)