[Archive copy mirrored from: http://lcweb.loc.gov/z3950/agency/copen/dcbib1.html]
Mapping of Dublin Core Elements
to Z39.50 Bib-1 Search Attributes
Ray Denenberg and Rebecca Guenther, Library of Congress
Note: Draft 1 of this document was not widely circulated.
July 22, 1997
Following is a proposed mapping from Dublin Core elements to Z39.50
Bib-1 Search attributes. This mapping assumes, in general, non-qualified
Dublin Core (with a few exceptions: Date, Coverage, and Language). As
Dublin Core qualifiers become standardized, this mapping may be changed.
Dublin Core element Title maps to bib-1 Use attribute
Dublin Core element Author/creator maps to bib-1 Use
attribute Author (1003).
- Subject and Keywords
Dublin Core element Subject and Keywords maps to bib-1 Use
attribute Subject Heading (21).
Dublin Core element Description maps to bib-1 Use attribute
Dublin Core element Publisher maps to bib-1 Use attribute
- Other Contributors
Dublin Core element Other Contributors maps to bib-1 Use
attribute Author (1003).
Discussion: Dublin Core element Other Contributors is
intended to distinguish primary authors from secondary
contributors, where the latter may include, for example, an
illustrator. This distinction seems more meaningful for retrieval
than for searching. Searching specifically on a secondary
contributor seems unlikely; therefore Other Contributor maps to
the same search access point as Author.
This assumes, however, that Z39.50 servers will map Author both to
primary and secondary authors. Field 720, Added entry -
Uncontrolled Name (recently added to USMARC), should be added, in
the Bib-1 set semantics, to the list of MARC fields corresponding
to author (1003).
Note: Dublin Core Workshop 4 concluded that the
definition of element Date requires revision, to include various
types of dates.
Dublin Core element Date maps to one of the following bib-1
Use attributes, depending on the type of date to be searched:
Additional Use attributes corresponding to additional date types will
be proposed for addition to bib-1 if necessary.
- Date of publication (31)
- Date added to database (1011)
- date last modified (1012)
- Resource Type
Dublin Core element Resource Type maps to bib-1 Use
attributes material type (1031) and content
Format will be proposed as new bib-1 Use attribute,
corresponding to Dublin Core element Format.
- Resource Identifier
Dublin Core element Resource Identifier maps to bib-1 Use
attributes identifier--standard (1007), and doc-id
Note: Identifier--standard would be used for ISBN,
ISSN, etc., and doc-id for urls, etc. However, doc-id might not
be appropriate based on its definition, from the bib-1 semantics
document: "A persistent identifier, or Doc-ID, assigned by a
server, that uniquely identifies a document on that server." The
primary problem with this definition is the implication of
persistence. But common usage of attribute doc-id does not seem to
assume persistence, thus the definition may not be consistent with
common usage, and a proposal may be developed to modify that
Source will be proposed as new bib-1 Use attribute,
corresponding to Dublin Core element Source.
Dublin Core element Language maps to bib-1 Use attribute
code-language (54), for use when the supplied search term is
a language code.
An additional bib-1 Use attribute, text-language, will be proposed,
for use when the search term is a language specified in text form
Dublin Core element Relation is currently regarded as an
experimental element, requiring further development. Therefore a
mapping to bib-1 is premature, and none is currently proposed.
Dublin Core element Coverage maps to bib-1 Use attribute
map-scale (1024) for spatial coverage. For temporal
coverage, a new bib-1 Use attribute, temporal-coverage, will be
- Rights Management
The content of Dublin Core element Rights Management might
be an actual rights management statement, or it may be a link to a
rights management statement. The requirement(s) for searching have
not been articulated. However, the following requirements have been
speculated: to search within a rights management statement (assuming
that the content is an actual statement rather than a pointer); or to
locate documents that point to a specific rights management
statement, or documents that have or do not have a rights management
pointer (assuming that the content is a pointer). Proposed mapping(s)
are deferred pending clarification of search requirements (comments
solicited). There may be a need to search within a statement and/or
on a link. These would correspond to different bib-1 Use attributes:
"rights management statement" and "rights management link". One or
both of these may be proposed as new bib-1 attributes if necessary,
as indicated by requirements.
July 22, 1997