VMS Help CONVERT, /DOCUMENT, CDA Base Service Converters, Text Output Converter, CONTENT_MESSAGES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    CONTENT_MESSAGES [ON,OFF] causes the Text output converter to
    put a message in the output file each time a nontext element is
    encountered in the intermediate representation of the input file.
    If this option is not specified, the default is OFF; if this
    option is specified without a value, the default is ON.