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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
>