VMS Help MERGE, Specification File Qualifiers, /DATA, Qualifier Values  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 field-name

    Specifies the name of a field in a record. The field-name must be
    defined previously in a /FIELD qualifier.

 condition-name

    Specifies a condition-name that has been defined previously in a
    /CONDITION qualifier.

 new-contents

    Specifies how the record is to be altered. The new-contents can
    be a constant or a field-name that has been defined in a /FIELD
    qualifier.