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Kudos- just wanted to add a thanks for this, and note that there are links
from the authorities search on id.loc.gov.

Noticed this yesterday when trying to explain how LCSH handles the C#
programming language ( computer program language is the new cookery)- having
the full record makes it a lot easier to explain.

ksclarke   noted that there's no bulk marc xml downloads yet;   if the
Z39.50  bridge is being used that might explain it (are the records the
canonical marc xml, or are they being sourced from authorities.loc.gov,
which has been known to have some bad records in it. Also is there a
maximum  gap between fetches that can leave you at risk of having a new
voyager session created, which is really expensive?

Simon
On Sep 7, 2011 2:30 PM, "Dixson, Larry" <[log in to unmask]> wrote:
> Apologies for cross posting.
>
> The Library of Congress is pleased to announce an expansion of its LCCN
Permalink Service for the Library's name and subject authority records.
These persistent URLs are based on the Library of Congress Control Number
(LCCN). As with bibliographic records, LCCN Permalinks are displayed on
authority record entries in LC Authorities<http://authorities.loc.gov>.
>
> Create an LCCN Permalink
> Simply begin your URL with the LCCN Permalink domain name --
http://lccn.loc.gov/ -- then add an LCCN.
> Examples: http://lccn.loc.gov/n79018774 or http://lccn.loc.gov/sh85026371
> LCCNs should be formatted according to the info:lccn<
http://info-uri.info/registry/OAIHandler?verb=GetRecord&metadataPrefix=reg&identifier=info:lccn/>
URI specification. Instructions are also available in the LCCN Permalink
FAQ<http://lccn.loc.gov/lccnperm-faq.html#n9>.
>
> How LCCN Permalink Works
> An LCCN Permalink retrieves a MARCXML-formatted record using the
Z39.50/SRU protocol. Both valid and cancelled LCCNs (MARC 21 fields 010a and
010z) are searched. Authority record displays for LCCN Permalink follow the
labelled display found in LC Authorites. MARCXML and MADS versions of the
records are also available. Displays link to entries in LC Authorities<
http://authorities.loc.gov> and the LC Online Catalog<http://catalog.loc.gov>
-- and, where appropriate, to entries in the Virtual International Authority
File<http://viaf.org> and LC Authorities and Vocabularies<http://id.loc.gov/
>.
>
> More Information
> Additional information on this service is available on the LCCN Permalink
FAQ<http://lccn.loc.gov/lccnperm-faq.html>. Specific questions can also be
sent to the Library of Congress through Ask-A-Librarian<
http://www.loc.gov/rr/askalib/ask-digital.html>.
>
>
>
-----------------------------------------------------------------------------
> Larry E. Dixson Internet: [log in to unmask]
> Network Development and MARC
> Standards Office, LA327
> Library of Congress Telephone: (202) 707-5807
> Washington, D.C. 20540-4402 Fax: (202) 707-0115
>