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CODE4LIB  October 2012

CODE4LIB October 2012

Subject:

Re: Browsable subject list

From:

Kevin Ford <[log in to unmask]>

Reply-To:

Code for Libraries <[log in to unmask]>

Date:

Mon, 29 Oct 2012 11:45:34 -0400

Content-Type:

text/plain

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Parts/Attachments

text/plain (59 lines)

 > My (erroneous) assumption was that if a record did not have a broader 
term (i.e. a 550 $wg value) then it would sit at the top of the subject 
tree, and that they would be the very general subjects headings. As I 
found this obviously not the case.
-- You're corrrect - LCSH doesn't work like this.  It's not a thesaurus.

 > Looking at our authority records it appears that it is not possible 
to build a thesaurus like structure which shows the relationship between 
terms.
-- Is that because your authority records do not have 5XX $wg's in them? 
  Or because it is not a thesaurus?

All said, take a look at http://id.loc.gov/

ID has all of LCSH available as a bulk download in a couple of flavors 
of RDF.  In the data, the broader and narrower relationships are 
expressed.  You could grab one of those and work with the data locally.

Alternatively, you could use a combination of the label service [1] and 
content-negotiation [2] to query for entries and then extract 
broader/narrower relationships in real-time.  For example, this label 
search will match the lexical word Hurricanes to its resource at ID.

http://id.loc.gov/authorities/subjects/label/Hurricanes

Following it, you'll get the HTML, but add a little content-negotation 
and you can get something more computer friendly:

curl -L -H "Accept: application/rdf+xml" 
http://id.loc.gov/authorities/subjects/label/Hurricanes

( There is a little short cut to the same - append ".rdf" to the end of 
the label request, like so 
"http://id.loc.gov/authorities/subjects/label/Hurricanes.rdf", - 
allowing you to sidestep the content-negotiation altogether.  Also works 
for ".json" and ".nt")

In any event, you'll see the broader/narrowers in the output.

Hope this helps,

Kevin


[1] http://id.loc.gov/techcenter/searching.html#knownLabel
[2] http://id.loc.gov/techcenter/




On 10/29/2012 10:04 AM, Stephen Graham wrote:
> Hi All - this is a new area for me, so it might be that I'm barking up the wrong tree or missing something fundamental. We are trying to build a browsable subject list in our discovery service (built on the Endeca technology). The  idea would be to expand terms and reveal the facets below which in turn are expandable - a subject tree which our users can browse the narrowr/broader terms.
>
> We use LCSH and my initial thought was to use the authority records from our catalogue (Symphony) to determine the relationship between terms. Dumping the authority records out I thought that I could use the 550 field - in particular the $w subfield and /0 (special relationship ). My (erroneous) assumption was that if a record did not have a broader term (i.e. a 550 $wg value) then it would sit at the top of the subject tree, and that they would be the very general subjects headings. As I found this obviously not the case. Looking at our authority records it appears that it is not possible to build a thesaurus like structure which shows the relationship between terms.
>
> I know The Library of Congress offer "Classification Web" (http://www.loc.gov/cds/classweb/).  This might be overkill for what we need. Is there an open API which may help achieve what we want?
>
> Stephen
>

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