That is a description of the feature table format, which is part of a GenBank file; it could be validated on its own. However, there isn't a specification for 'GenBank format' as a whole as far as I know; without that it's hard to validate (an example file exists but definitely can't be used for validation as it covers a single case and doesn't deal with variations such as WGS assembly master records).
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Thanks Chris. The feature table is what I'm interested in -- I don't care about the rest of the file. Edited my question as such.