[HFC3]

Is there any documentation on how to do this? Searching for "Build" returns no hits.

I'm assuming this type is supposed to let you have a new column X be assigned a value based on the value of existing column Y.

But;
1. I used a search filter "format:MOBI" to test this - column was filled with the template "format:MOBI" literal.
2. Where do you indicate what value is assigned?

Say I want to assign a new Yes/No column "MOBI" to Y (checked) if the a book includes a version in MOBI format (search filter "format:MOBI")

Thanks (yet) again