> it looks like LCSH
> is moving past this string-based hierarchy in favor of one expressed in
> terms of linked data.
-- Oh, I've never received that impression.  Pre-coordination - which you referred to as "hierarchical sets of terms" - is alive and well.  A number of studies were done in the second half of the 2000s that looked at the creation of LCSH headings.  Pre-coordination received significant attention in these studies and was ultimately confirmed as a good thing.  

Who knows why the precoordinated heading that was once used for "Mexican War, 1846-1848" was replaced, but that probably happened in 1986 (or 1991) based on the creation and most-resent modification times on that record.  In other words, at a time when the notion of Linked Data was non-existent.

Yours,
Kevin





> -----Original Message-----
> From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of
> Ethan Gruber
> Sent: Wednesday, June 05, 2013 9:41 AM
> To: [log in to unmask]
> Subject: Re: [CODE4LIB] LOC Subject Headings API
> 
> Are you referring to hierarchical sets of terms, like "United States--
> History--War with Mexico, 1845-1848"?  This is an "earlier established
> term" of http://id.loc.gov/authorities/subjects/sh85140201 (now labeled
> "Mexican War, 1846-1848").  Ed Summers or Kevin Ford are in a better
> position to discuss the change of terminology, but it looks like LCSH
> is moving past this string-based hierarchy in favor of one expressed in
> terms of linked data.
> 
> Ethan
> 
> 
> On Wed, Jun 5, 2013 at 9:32 AM, Joshua Welker <[log in to unmask]>
> wrote:
> 
> > I've seen those, but I can't figure out where on the id.loc.gov site
> > there is actually a URL that provides a list of authority terms. All
> > the links on the site seem to link to other pages within the site.
> >
> > Josh Welker
> >
> >
> > -----Original Message-----
> > From: Code for Libraries [mailto:[log in to unmask]] On Behalf
> > Of Dana Pearson
> > Sent: Tuesday, June 04, 2013 6:42 PM
> > To: [log in to unmask]
> > Subject: Re: [CODE4LIB] LOC Subject Headings API
> >
> > Joshua,
> >
> > There are different formats at LOC:
> >
> > http://id.loc.gov/authorities/subjects.html
> >
> > dana
> >
> >
> > On Tue, Jun 4, 2013 at 6:31 PM, Joshua Welker <[log in to unmask]>
> wrote:
> >
> > > I am building an auto-suggest feature into our library's search box,
> > > and I am wanting to include LOC subject headings in my suggestions
> > > list. Does anyone know of any web service that allows for automated
> > > harvesting of LOC Subject Headings? I am also looking for name
> > authorities, for that matter.
> > > Any format will be acceptable to me: RDF, XML, JSON, HTML, CSV... I
> > > have spent a while Googling with no luck, but this seems like the
> > > sort of general-purpose thing that a lot of people would be
> interested in.
> > > I feel like I must be missing something. Any help is appreciated.
> > >
> > > Josh Welker
> > > Electronic/Media Services Librarian
> > > College Liaison
> > > University Libraries
> > > Southwest Baptist University
> > > 417.328.1624
> > >
> >
> >
> >
> > --
> > Dana Pearson
> > dbpearsonmlis.com
> >