The symbols ' ' indicate that the feature is partial and the end point of the range is beyond the specified base number. Starting and ending positions can be indicated by base number or by one of the operators described below. The feature is complementary to the location indicated. Feature qualifiers begin at column 22. Qualifiers convey many types of information.
Some qualifiers require values selected from a limited set of choices.
These are called controlled vocabulary qualifier values. Although feature labels are optional, they allow unambiguous references to features. Feature labels must be unique within an entry, but can be the same as feature labels in other entries. The selected examples below illustrate various keys, feature loations and qualifiers.