All, The parameter tree was initially used for the content of the strings in Parameters_In and Parameters_Out. The modified BNF in the IBIS 5.0 AMI specification is an accurate representation and therefore an accurate method to parse the strings in Parameters_In and Parameters_Out. The .ami file is also in a parameter tree format, but has additional rules. I do not know how to capture these additional rules in a formal BNF that can be used to programmatically parse a .ami file. I did put the following document together than may very well be misnames a BNF, but I do think graphically documents the parser rules for the update .ami syntax. This follows up on the ideas that Bob suggested in his e-mail to the group on AMI Quick Reference. I think it is useful as is, any suggestions on how to make it more readable, or BNF like would be much appreciated. Walter Walter Katz 303.449-2308 Mobile 720.333-1107 wkatz@xxxxxxxxxx www.sisoft.com