LISTSERV mailing list manager LISTSERV 16.5

Help for CODE4LIB Archives


CODE4LIB Archives

CODE4LIB Archives


CODE4LIB@LISTS.CLIR.ORG


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

CODE4LIB Home

CODE4LIB Home

CODE4LIB  April 2011

CODE4LIB April 2011

Subject:

Re: LCSH and Linked Data

From:

Kelley McGrath <[log in to unmask]>

Reply-To:

Code for Libraries <[log in to unmask]>

Date:

Fri, 15 Apr 2011 16:21:52 -0700

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (397 lines)

A few belated ramblings from a cataloger:

 

1) GEOGRAPHICAL SUBDIVISION

 

It used to be that geographical subdivision was much more flexible and was supposed to convey different meanings depending on where it occurred in the string. Then there was some research showing that not only did users not know how to interpret this, but catalogers did not understand these rules and were constructing inconsistent headings. This led to a movement for simplification. From LC's Subject Heading Manual:

 

"The Subject Subdivisions Conference that took place at Airlie, Virginia, in 1991 recommended that the standard order of subdivisions be [topic]–[place]–[chronology]–[form].  In 1992, it was decided to adopt that order where it could be applied." 

 

This leaves a standard order of $a, $b [rare], $x, $z, $y, $v with some exceptions.

 

As was pointed out earlier, the current rule is to "put the geographic subdivision ($$z) as near the end as is legal." This can be mechanically determined based on a fixed field in the authority record. Although fixed fields in bib records are often unreliable, those in authority records are probably as accurate as they can reasonably be made to be, allowing for human error. This is both because LC coordinates training and reviews records and because the fixed fields are used as decision points so there are short-term consequences for later catalogers if they're not done right.

 

The fixed field (008/06) in LCSH authority records that tells you if a geographic subdivision can come after the heading (http://www.loc.gov/marc/authority/ad008.html). Id.loc.gov doesn't seem to give you that info, but it might be nice if it did.

 

650 _0 $a Education [sh 85040989, Geo Subd = i = Subdivided geographically-indirect] $z England [n  82068148] $x Finance [sh2002007885, Geo Subd = # = Not subdivided geographically]

 

650 _0 $a Education [sh 85040989, Geo Subd = i = Subdivided geographically-indirect] $x Economic aspects [sh 99005484 Geo Subd = i = Subdivided geographically-indirect] $z England [n  82068148].

 

One reason not to rely on found order is that LC has been moving in the direction of the Airlie House recommendation so in addition to the usual mistakes, you'll probably come across a lot of older forms if you take data from the wild. For example, until somewhat recently, the "economic aspects" record above looked like the "finance" one so you'll probably still see records like 

 

650 _0 $a Education $z England $x Economic aspects.

 

A) Indirect Subdivision

 

In general, when a heading string starts with a geographic name, it is in direct order:

 

651 _0 $a London (England) [n  79005665] $x Economic conditions [sh 99005736].

 

If a geographic name is modifying a topical heading, it is given in indirect order:

 

650 _0 $a Education [sh 85040989] $z England $z London [n  79005665; covers both $z subfields].

 

Thanks to a project that OCLC did for FAST (which uses only the indirect style), in most cases both of these can be extracted from the authority record, which will have a 781 with the indirect form added:

 

n  79005665

151  $a London (England)

451  $a Londinium (England)

...

781 0 $z England $z London

 

Some records (usually for geographic areas within cities) cannot be used to modify topical headings, but can be used in 651$a as the main term in a heading string. There are identified by a note and lack of 781.

 

n  85192245

151  $a Hackney (London, England)

667  $a SUBJECT USAGE: This heading is not valid for use as a geographic subdivision.

 

B) Geographic Entities and Name vs. Subject Headings

 

Notice that in the above example, the control number/identifier for Education starts with sh while the one for London starts with n. This is an important distinction. Heading identifiers that start with sh are LCSH terms found in the subject authority file and are available from id.loc.gov. I think these all fall into FRBR's group 3 bib entities. Heading identifiers that start with n are stored in the LC NAF (Name Authority File) and are not available as linked data. These are the FRBR group 1 and 2 entities and maybe some from group 3. Most of these can also be used as subjects in LCSH. So you can't actually get at all the building blocks of LCSH strings nor use linked data for all subjects.

 

Named geographic features (e.g., mountains, lakes, continents) are established in the subject authority file using the rules in the Subject Cataloging Manual for LCSH. The headings are tagged 151 and can be found at id.loc.gov.

 

sh 85082617 

151  $a McKinley, Mount (Alaska)

 

sh 85044620 

151  $a Erie, Lake

 

sh 85008606

151 $a Asia

 

Geographic features appear in bib records only as 651 or 650+ $z subject terms.

 

Jurisdiction names (e.g., cities, states, countries) are established in the name authority file using descriptive cataloging rules (e.g., AACR2 ch 23 and the NACO Participants' Manual).  They are tagged 151 and cannot be found at id.loc.gov

 

n  79058874 

151  $a Paris (France)

 

n  79021953

151  $a Oregon

 

n  81013960

151  $a Mexico

 

Depending on their function, jurisdiction names can be tagged both as geographic subject headings (651, 650+ $z) and as tagged as corporate names (110, 710 and as subjects 610) in bibliographic records.

 

For an example, go to http://lccn.loc.gov/92643471 and click on “View LC holdings for this title in the:  LC Online Catalog”  and then MARC view. 

 

110 1_ $a New York (N.Y.)

245 10 $a New York City Charter and Administrative Code. $p Amendments, complete with indices.

650 _0 $a Delegated legislation $z New York (State) $z New York.

 

There is a famous part of the Subject Headings Manual (H405) known as the “division of the world” that addresses ambiguous entities (such as building and park names) and

1.       whether they are established in the name authority file or the subject authority file

2.       whether they are established using the descriptive cataloging rules or subject cataloging rules

3.       how they are tagged in MARC (usually 110 corporate name or 151 geographic name)

 

The current list of these categories can be found at http://www.loc.gov/catdir/pcc/saco/alpha405.html.

 

Because the rules and processes for naming things are different for descriptive rules and subject rules, there is some fallout from this decision.

 

Differences in what the name is because of different rules

 

Differences in the use of related broader terms

Subject authority records can have broader terms, such as

 

sh 85052253

151 $a Fuji, Mount (Japan)

550  $a Mountains $z Japan $w g [broader term]

550  $a Volcanoes $z Japan $w g [broader term]

781 $z Japan $z Fuji, Mount

 

This means that if you browse the subject authority file for Mountains--Japan, you'll get a list of the 92 mountains in Japan that have been established in LCSH. You can't do this in the name authority file.

 

Differences in how name changes are treated

Descriptive rules establish a separate, linked record for every name variation. As 110/710 access points (authors), the heading used is the one for the name at the time of writing:

 

n  82089311

Constantinople

See also later heading Istanbul (Turkey)

Valid as a name heading for the period 330-1453

 

n  79034985

Istanbul (Turkey)

See also earlier heading Constantinople

Valid as a name heading after 1453

 

Subject rules use the latest name for more or less co-extensive territories. Thus only Istanbul (Turkey) is used as a subject and the historical subdivisions are all listed there. For example:

 

Istanbul (Turkey) $x History $y Siege, 1203-1204

Istanbul (Turkey) $x History $y 20th century

 

The Constantinople record has the follow 667 note:

 

SUBJECT USAGE: This heading is not valid for use as a subject.  Works about this place are entered under Istanbul (Turkey).

 

Lack of co-extensivity results in separate subject authority records as is the case for Russia, the Soviet Union and Russia (Federation).

 

Differences in who creates the record and how easily and quickly it can be done

Creation of name authority records is widely distributed through LC's cooperative cataloging program (NACO). Name authority records exist largely independently. It is only necessary to uniquely identify the name with the existing name authority file (at least ideally), provide sufficient cross-references that someone can reasonably find the name, and link the name to any immediately preceding or following names if those are present in any bibliographic records.

 

Creation of subject authority records is centralized at LC. Although the cataloging community can make suggestions through a formal process (SACO), all proposals are vetted by LC, who make the final decision. Although LCSH has many problems in practice, it is intended to function as a coherent, interdependent web. This requires a big picture perspective and more attention to how the individual headings fit into the whole. 

 

One more twist

 

Occasionally, geographic names can be used in 6xx $x if they are being used as topics. For example

 

100 $a Shakespeare, William, $d 1564-1616 $x Knowledge $x Greece [Shakespeare’s knowledge about Greece]

150 $a Information storage and retrieval systems $x United States [Information storage and retrieval systems about the U.S.]

 

More info

 

For more info on how this works, see the ALCTS/PCC manual for basic LCSH training at http://www.loc.gov/catworkshop/courses/basicsubject/pdf/lcsh-trnee-manual.pdf. In particular, session 10 (Names as Subjects) and the part beginning on 11-11 about MARC coding of geographic names.

 

2) HEADINGS WHERE NOT ALL COMPONENTS ARE ESTABLISHED EXPLICITLY

 

The example in the discussion was

 

650 _0 $a English language $v Dictionaries $x Albanian.

 

This could potentially be mapped to 

sh 85043413 150 English language    +   sh 99001605 185 $v Dictionaries $x French, [Italian, etc.]  

 

And perhaps even expanded to $v Dictionaries + $a Albanian language. In the end you might produce a useful list of languages in LCSH by this means. For everything in $x, there ought to be a corresponding 150 with "language" appended. There are a number of these pattern subdivisions. The other common ones are for religious topics, such as the following, and some related to wars or nationalities.

 

180 ǂx Religious aspects ǂx Baptists, [Catholic Church, etc.]

180 ǂx Religious aspects ǂx Buddhism, [Christianity, etc.]

 

The authority record headings can be identified by their use of etc. and brackets. 

 

Music headings are also often not constructed explicitly but consist of headings built up from components like names of instruments and using certain rules. You could theoretically deconstruct most of these, but I don't know that it would be worthwhile. When I was at Ball State, we did something like this (over a bounded set of records, though) where we mapped chamber music subject headings to coded data to drive a search form that allowed users to search by instrumentation (http://www.bsu.edu/libraries/viewpage.asp?src=./librarycatalogs/chambermusic.html). Although that did require some manual follow-up (for pieces where the instrumentation and genre are spread across more than one heading), it was mostly an automated process.

 

ENUMERATED HEADINGS

 

I also am not sure that I agree with the suggestion that 

 

“The second issue using your example is that you want to find the ‘longest’ matching heading. While the pieces parts are there, so is the enumerated authority heading:

 

150 __ $a Education $z England

 

as LCCN sh2008102746. So your heading is actually composed of the enumerated headings:

 

sh2008102746    150 __ $a Education $z England

sh2002007885    180 __ $x Finance”

 

For a couple reasons.

 

1) A lot of things are currently arbitrarily enumerated. It used to be that things were only enumerated when they couldn’t be constructed from the rules, but more recently LC has begun an attempt to explicitly establish all the common combinations in an attempt to appease ILS’s supposed need for strings for validation (what I think is a misguided game of whack-a-mole). These records can be identified by the 667 note “Record generated for validation purposes,” but not, so far as I can tell, at id.loc.gov.

 

I tried to describe an alternate vision of encoding the information needed for creating the combinations rather than the exponentially large number of combinations themselves in the section called Use of these Categories to Improve Consistency and Authority Control in part 9 (http://journal.code4lib.org/articles/23#problem9) of my Code4Lib Journal article on LCSH and faceting. LC is actually starting some experiments in this direction.

 

The point is that there is often no logical difference between what is enumerated and what’s not; it’s just what LC happens to have gotten to. So I think this will leave you with inconsistent and less useful data.

 

2) I also think you would get more flexibility and bang for your buck if you broke the headings down into the smallest possible parts.

 

Education + England + Finance 

 

Because this gives you more pieces to offer up to people separately or potentially in any combination.

 

FWIW, there is also

 

sh 85041008 

150  $a Education $x Finance

 

So if the $x Finance is ever made geographically subdividable (which is the trend), your enumerated bit (at least if you go in order) may change. 

 

I’m sure this is way too much info for most (or all) on this list, but in case it is helpful, I thought I’d throw it out there.

 

Kelley

Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004
February 2004
January 2004
December 2003
November 2003

ATOM RSS1 RSS2



LISTS.CLIR.ORG

CataList Email List Search Powered by the LISTSERV Email List Manager