And since Terry just responded rather humbly, allow me to plug his MarcEdit:

http://marcedit.reeset.net/adding-localcustom-linked-data-resolution-to-marcedits-linked-data-tool

I was just looking into this reference as his email arrived.

Anyways - take a look at MarcEdit.  I believe it is possible to match 
these labels with URIs and insert them into MARC records.  Terry, please 
correct me if I am wrong.

Yours,
Kevin


On 8/25/17 11:56, Terry Reese wrote:
> The $0 is the correct field, but you would not link to this value: http://id.loc.gov/authorities/subjects/sh85095334 not the HTML page.  The $0 and $1 are reserved for machine readable endpoints.  They should *not* include links to HTML pages.
> 
> --tr
> 
> -----Original Message-----
> From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Kevin Ford
> Sent: Friday, August 25, 2017 12:55 PM
> To: [log in to unmask]
> Subject: Re: [CODE4LIB] Searching LC Name Authority file programmatically
> 
> Yes, I believe it is $0, but if you insert a URI you do not include a parenthetical notation.  See:
> http://www.loc.gov/marc/bibliographic/ecbdcntf.html
> 
> All that said, best check with a cataloger.
> 
> HTH,
> Kevin
> 
> 
> 
> On 8/25/17 11:37, Josh Welker wrote:
>> Related question: I want to store linked data URI references in my
>> MARC records. If I want to store the URI to an LC Name Authority entry
>> such as this one
>> (http://id.loc.gov/authorities/names/n2010056162.html), what is the
>> best way to do that? My guess would be to store it in a 100 control
>> subfield 0, but I am not sure how to format it. Would it be something like this?
>>
>> (lcname)http://id.loc.gov/authorities/names/n2010056162.html
>>
>> I'm guessing there is some technical acronym I should use instead of
>> "lcname."
>>
>> Joshua Welker
>> Information Technology Librarian
>> James C. Kirkpatrick Library
>> University of Central Missouri
>> Warrensburg, MO 64093
>> JCKL 2260
>> 660.543.8022
>>
>>
>> On Fri, Aug 25, 2017 at 11:04 AM, Josh Welker <[log in to unmask]> wrote:
>>
>>> That's exactly what I needed. Thanks, Kevin!
>>>
>>> Joshua Welker
>>> Information Technology Librarian
>>> James C. Kirkpatrick Library
>>> University of Central Missouri
>>> Warrensburg, MO 64093
>>> JCKL 2260
>>> 660.543.8022 <(660)%20543-8022>
>>>
>>>
>>> On Fri, Aug 25, 2017 at 10:50 AM, Kevin Ford <[log in to unmask]> wrote:
>>>
>>>> There's no reason to screen scrape the results.
>>>>
>>>> The label service permits the use of the "Accept" header.  For example:
>>>>
>>>> curl -i -L -H "Accept: application/rdf+xml"
>>>> http://id.loc.gov/authorities/label/orchids
>>>>
>>>> Take note of the initial set of response headers:
>>>>
>>>> HTTP/1.1 302 FOUND
>>>> Location: http://id.loc.gov/authorities/subjects/sh85095334
>>>> X-URI: http://id.loc.gov/authorities/subjects/sh85095334
>>>> X-PrefLabel: Orchids
>>>> Cache-Control: public, max-age=1209600
>>>> Content-Length: 0
>>>> Date: Sat, 29 Jul 2017 12:41:00 GMT
>>>> Server: Apache
>>>> X-Varnish: 95467183 53781367
>>>> Age: 2343793
>>>> Via: 1.1 varnish-v4
>>>> X-Cache: HIT
>>>> X-Cache-Hits: 24
>>>> Connection: keep-alive
>>>>
>>>> If you want, you could perform only a HEAD request on the label
>>>> service and then use the X-URI and X-PrefLabel headers to gather the
>>>> info you need.  NB: The service works on an exact match, more or
>>>> less; take off the 's' of 'orchids' and you'll get an entirely different result.
>>>>
>>>> You can also operate on the search results - not the label service -
>>>> programatically.  See "Supported Search serialization formats" here:
>>>> http://id.loc.gov/techcenter/serializations.html   One XML-based option
>>>> and a JSON one too.
>>>>
>>>> Yours,
>>>> Kevin
>>>>
>>>>
>>>>
>>>>
>>>> On 8/25/17 10:39, Josh Welker wrote:
>>>>
>>>>> Thanks, Nathan. That looks like it will work if I do it manually,
>>>>> but there is no interface for doing it programmatically. Is LC okay
>>>>> with me screen scraping the search results?
>>>>>
>>>>> Joshua Welker
>>>>> Information Technology Librarian
>>>>> James C. Kirkpatrick Library
>>>>> University of Central Missouri
>>>>> Warrensburg, MO 64093
>>>>> JCKL 2260
>>>>> 660.543.8022
>>>>>
>>>>>
>>>>> On Fri, Aug 25, 2017 at 10:18 AM, Trail, Nate <[log in to unmask]> wrote:
>>>>>
>>>>> You can try our "label" service. See under "known label retrieval" here:
>>>>>> http://id.loc.gov/techcenter/searching.html
>>>>>> I would be glad to help further.
>>>>>>
>>>>>> Thanks, Nate
>>>>>>
>>>>>> -----------------------------------------
>>>>>> Nate Trail
>>>>>> Network Development & MARC Standards Office LS/ABA/NDMSO LA308,
>>>>>> Mail Stop 4402 Library of Congress Washington DC 20540
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Code for Libraries [mailto:[log in to unmask]] On
>>>>>> Behalf Of Josh Welker
>>>>>> Sent: Friday, August 25, 2017 11:12 AM
>>>>>> To: [log in to unmask]
>>>>>> Subject: [CODE4LIB] Searching LC Name Authority file
>>>>>> programmatically
>>>>>>
>>>>>> I have sort of inherited authority control recently at my library,
>>>>>> and I want to find some way to automate some common workflows. I
>>>>>> am looking for an easy way to query blind name references against
>>>>>> the LC Name Authority master file. There is no API for searching
>>>>>> it on the web, and the name file itself is 10+ GB and hard to work
>>>>>> with.
>>>>>>
>>>>>> Here are options as I see them:
>>>>>>
>>>>>>
>>>>>>       - Screen scrape the search engine at id.loc.gov.
>>>>>>       - Load the 10+ GB name file into a local database to query
>>>>>>       programmatically.
>>>>>>
>>>>>> Does anyone have experience with either method? Does some other
>>>>>> method exist I am not aware of?
>>>>>>
>>>>>> Joshua Welker
>>>>>> Information Technology Librarian
>>>>>> James C. Kirkpatrick Library
>>>>>> University of Central Missouri
>>>>>> Warrensburg, MO 64093
>>>>>> JCKL 2260
>>>>>> 660.543.8022
>>>>>>
>>>>>>
>>>