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When you refer to a field in Caliper Script, you use a field spec where the view name must be a string variable, and the field name may be a string variable.It is a lot easier to write generic code this way. Here is a little macro that dittos values down a field, filling in nulls with the last non-null value until the next non-null is encountered.

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Caliper Corporation
Caliper: Producer of US and UK GIS Mapping Software and Transportation Planning Software
http://www.caliper.com/