Compression or expansion (itemization) of detailed enumeration and chronology data may be done by computer algorithm if no break exists within the levels of enumeration or chronology.  A fuller description of this capability is given in the 853-878 Holdings Data - General Information section.  The data elements that are required to be present for the compression or expansion of the contents of the enumeration and chronology fields for basic bibliographic units (field 863) and supplementary material (field 864) are described in the Input Conventions area of the 853-855 Captions and Pattern - General Information section.  The content of an enumeration and chronology field for indexes (field 865) may not be automatically compressed or expanded because of the potential for an ambiguous holdings statement.

See also:

Holdings Data Format:  Introduction