Dedupe 2.1

Dedupe 2.1: Numeric Field Hits - Group 1

Numeric Field Hits

LCCN

historical fact

LC changed the structure of the LCCN beginning on Jan. 1, 2001 in order to accommodate a four-digit year. The length of the control number remains 12 characters as it was prior to the change. However, in the old LCCN structure (A), suffixes were occasionally used. Under the new LCCN structure (B), the location of elements is slightly altered to accommodate a four-digit year. Under both structures, the prefix, year and serial number are the basic elements required to make a LCCN unique.

LCCN - 010 subfield a: For the Library of Congress Control Number, the subfield a will be used as default. For searching only (not changed in the final record), this field will be normalized. This will remove extra spaces, punctuation and extra data that is usually contained in a different subfield.

• Examples of LCCN normalization:
  

 Example 1: ###755262" will become "75005262"
 Example 2: ###80020863 /AC/r86" will become "80020863ACr86" and in this case "80020863" as well.
            Both will be searched to find a potential match.

ISBN

ISBN - 020 subfield a:

For the International Standard Book Number, the subfield a will be used as default. For searching only (not changed in the final record), this field will be normalized. This will remove extra spaces, punctuation and extra data that is usually contained in a different subfield.

• Examples of ISBN normalization:

 Example 1: "0937295124 : $12.95" will become "0937295124"
 Example 2: "978-0-06-108096-8" will become "9780061080968"
 Example 3: "0688076815 (pbk.)" will become "0688076815"

historical fact

The structure of the ISBN has changed over the past thirty years. Prior to 1977, the 020 field was not repeatable and multiple ISBNs and related information were placed in repeated subfields. Older bibliographic records may still have multiple ISBNs in a single 020 field rather than in multiple 020 fields. January 1, 2007 marked the final date for fully adopting ISBN-13. Between 2005 and 2008, publishers were encouraged to supply both an ISBN-10 and an ISBN-13 for the same manifestation, based on guidelines issued by the International ISBN Agency (IIA). The Library of Congress began accommodating ISBN-13 on October 1, 2004. At the beginning of 2007 is when publishers were expected to supply only ISBN-13.

ISSN

ISSN - 022 subfield a:

For the International Standard Serial Number, the subfield a will be used as default. For searching only (not changed in the final record), this field will be normalized. This will remove extra spaces, punctuation and extra data that is usually contained in a different subfield.

• Examples of ISSN normalization:

 Example 1: "0829-0784" will become "08290784"
 Example 2: "0009-5753 PERIODICAL" becomes "00095753"

Since each of the above fields have unique standards, the normalization option is default, but can be turned off if preferred.

links

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