Complex sentence: When the publication has more than one edition; for example: "2nd", "Revised" etc. Displays "ed." after this field, so produces "2nd ed." Does not display if a periodical field is defined.
Split into simpler sentences: When the publication has more than one edition; for example: "2nd", "Revised", and so forth. Appends the string "ed." after the field, so produces "2nd ed." Does not display if a periodical field is defined.