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That's not a RDB file, it's a Calibre RVE database ...
The concept that you are looking for is "tagged values". Items and values can be tagged. In your case, the properties are mapped to tagged values. You can obtain the tag ID from the value, use RdbValue#tag_id object. To get the tag ID to look for, use ReportDatabase#tag_id(name).
Thanks. That's already planned :-)