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When we "upgraded" the rules technology for both VALIDATION and FLOW areas of FIXatdl we were really most interested in adding NOT AND. NOT OR was then likely added "to match" -- however its likely of little "real world" use. NOT AND however really opens up some exceptionally interesting capabilities in VALIDATION and FLOW rules processing. See the quote below from WikiPedia and know that is exactly what we intended to build in to FIXatdl v1.1 This capability is not to be underestimated! "The NAND gate has the property of functional completeness. That is, any other logic function (AND, OR, etc.) can be implemented using only NAND gates. An entire processor can be created using NAND gates alone." [You can unsubscribe from this discussion group by sending a message to mailto:unsubscribe+100932...@fixprotocol.org] -- You received this message because you are subscribed to the Google Groups "Financial Information eXchange" group. To post to this group, send email to fix-proto...@googlegroups.com. To unsubscribe from this group, send email to fix-protocol+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/fix-protocol?hl=en.