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→3.6 Fill Character
A complete record, fully content designated, is naturally the preferred record for international
exchange purposes. In some cases, however, it may not be possible to convert a national record into
the ''UNIMARC Holdings Format '' and provide the full content designation and coded information as
prescribed. To minimize the ambiguities that could result if the indication of this lack of information
were left to the discretion of each national agency faced with the circumstances described above, a
character, hereafter referred to where this occurs as a "fill character," is used in place of the required
information. This character will be the "'''|'''" (vertical line, code table position 7/12 in [[wikipedia:en:ISO/IEC 646|ISO 646]]).
The fill character can be used whenever a content designator or coded information cannot be
determined by the encoding agency. It thus occurs in the following situations: : i) encoding agencydoes not use this content designator or code this information, or :ii) encoding agency uses this contentdesignator or codes this information but in this particular record does not know the correct value, or:iii) encoding agency uses similar values for this content designator or coded information but theycannot be translated to the exact ''UNIMARC Holdings Format '' equivalents.
The following rules apply to the use of the fill character: fill characters may only be used for
indicators and coded data values that are not mandatory, thus fill characters may not be used in the
[[Hold/Record label|Record Label ]] or [[Hold/Directory|Directory ]] as subfield identifiers or to replace punctuation or other special charactersin the data portion of fields.
==3.7 Coded Data Values==