There are three kinds of fields in the ISO 2709 record:
- Record identifier field—identifying the record and assigned by the organization that creates the record. The record identifier field has tag 001.
- Reserved fields—Reserved fields supply data which may be required for the processing of the record. Reserved fields always have a tag in the range 002–009 and 00A–ZZZ.
- Bibliographic Fields—these are in the range 010–999 and 0AA–ZZZ. The bibliographic fields contain data and a field separator (IS2 of ISO 646). They can also have these optional sub-parts:
- Indicator (0–9 characters, as coded in the Leader)—Indicators generally provide further information about the contents of the field, the relationship between the field and other fields in the record, or about action required in certain data manipulation processes (including display labels).
- Identifier (0–9 characters)—This identifies data within the bibliographic field. Where used, identifiers are composed of a delimiter (1 char, IS1 of ISO 646) and an identifying code (1–9 chars, as defined in the leader), plus a variable length string containing the data.
Read more about this topic: ISO 2709
Famous quotes containing the word fields:
“To the Ocean now I fly,
And those happy climes that ly
Where day never shuts his eye,
Up in the broad fields of the sky:”
—John Milton (16081674)
“Like a man traveling in foggy weather, those at some distance before him on the road he sees wrapped up in the fog, as well as those behind him, and also the people in the fields on each side, but near him all appears clear, though in truth he is as much in the fog as any of them.”
—Benjamin Franklin (17061790)
“As the fields fear drought in autumn, so people fear poverty in old age.”