X53 Input Conventions

Order of Subfields: The caption hierarchy (in subfields $h and $k) and caption (in subfield $j) follow all elements of the classification number(s). A table number in field 153 (Classification Number) is identified in 008/06 (Kind of record) , code b and in field 453 / 553 (Invalid or Valid Number Tracing) is identified by the first indicator, value 1 (Source of classification number). For table numbers, subfield $y and/or subfield $z are the first subfield(s).

Invalid Classification Numbers: The punctuation (for LCC, parentheses; for DDC, brackets) indicating that the number is invalid is not input as data. For display purposes, punctuation may be generated around the number to designate that it is invalid, or in cases where one number of the span is invalid around the portion which is invalid. For a classification number in field 153 (Classification Number), the information about its validity is included in 008/08 (Classification validity) . For a classification number in field 453 or 553, the punctuation indicating invalidity may be generated on the basis of the tag.

Number Spans: The beginning and ending numbers of a number span are usually separated by a hyphen in a display. This hyphen may be generated as a display constant preceding the first occurrence of subfield $c.

Display of Classification Numbers and Captions: Conventions for the display of classification numbers and captions as they appear in the published schedules are considered local information and are not treated in this format.

For return, select:

X53 Classification Numbers - General Information