Dedupe 2.4
Contents
Dedupe 2.4: Group 1 - 008 Date (Verify)
008 date
Backstage uses two date blocks from the 008 field: bytes 7-10 represent date1 and bytes 11-14 represent date2.
Verify Method
Parameters in this verification allow partial dates to match to either full dates or other partial dates. Different methods are used in this FULL/PARTIAL/WITHIN.
Full
Full compares both date1 and date2 of each record; both must match:
Record A:
date1 date2
008 1972 1973
Record B:
date1 date2
008 1972 1973
In this example, both date1 (1972) & date2 (1973) of Record A & B match. Matching on Full returns a match for these two records.
Partial
Partial compares date1 of each record. If no match it compares date2 (as long date doesn't contain fill characters--<space> or <pipe>):
Record A:
date1 date2
008 1971 1973
Record B:
date1 date2
008 1972 1973
Since Record A's date1 (1971) is a mismatch against Record B's date1 (1972), both record's date2 (1973) are considered. Matching on Partial returns a match for these two records.
Within
Within compares date1 of one record to date2 of other record, and vice-versa. If no match it also does a partial verify:
Record A:
date1 date2
008 1970 1973
Record B:
date1 date2
008 1973 1972
In this example, date1 in Record A (1970) does not match date2 in Record B (1972). So, it checks date2 of Record A (1973) against date1 of Record B (1973). Matching on Within returns a match for these two records.
Tolerance
The date tolerance for the Verify Date parameter is the number of years the date can differ and still qualify as a matched record. This allows for more leniency with hits on the 010/020 and stricter criteria for the TITLE or other fields. The tolerance allows for dates to match within a specified number of years.
Match exactly
The year 1996 can only verify with another record that has the year 1996. It will not match either 1995, 199u, 199-, or 199 (ends with blank).
Off by 1 year
The year 1996 would match either 1995, 1996, or 1997. It would not match 1994, 1998, or years where the ending digit is missing or contains a fill character.
Off by # years
This allows the year tolerance to be increased by the Library for two-plus years. This is helpful when the desired outcome is to match the same decade of the original year in question.
- Although Backstage recommends using the 008 date blocks, if these are missing or considered unreliable, please consult with Backstage staff for using the 260 $c publication date instead.
Default
| Group 1 (010, 020, 022) | |
|---|---|
| 008 date blocks must verify; can be off by 1 year | |
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