FGI Glossary

October 9, 2009 by
Filed under: Library, post 

Below is a glossary of terms that are commonly used when talking about the Depository Library Program, government information in libraries, and digital technologies. It’s important to have clearly defined terms when discussing issues of access to and preservation of digital government information and so we’ve created an ongoing glossary of key terms. Please contact us at admin AT freegovinfo DOT info with questions or to suggest other terms for the glossary.


API – An Application Programming Interface (API) is a definition of how computer programs can interact with a particular dataset, database, web site, or other cache of information. Programmers can use an API to design ways of dynamically interacting with the target data. An API increases the flexibility of information provision because, rather than limiting users to a single interface provided by the information provider or publisher, the API allows others to program different interfaces customized for different communities or purposes. Mashups often use open APIs to combine data from different sources (e.g., census and crime and maps) to re-use and re-purpose what would otherwise be separate stove-pipes of information and static documents.

Backup – A copy of data intended to be used to restore the original after loss or corruption of the original.

Cloud computing –

Dark Archive – “An archive that cannot be accessed by any users…. The purpose of a dark archive is to function as a repository for information that can be used as a failsafe during disaster recovery.” http://www.webopedia.com/TERM/D/dark_archive.html

Digital Deposit – U.S. government publications in digital format deposited in FDLP libraries. In other words, GPO sends (i.e., deposits) authentic digital files to depository libraries. A Digital Depository has a digital collection that it selects, acquires, organizes, and maintains. Note that, although a library may also maintain links to digital publications that are housed, organized, and maintained by someone else, and that this may be useful, this is not “digital deposit” because nothing is deposited.

FDDLP, Federal Digital Depository Library Program – The FDLP with digital deposit.

Infrastructure, Financial – The existing and continuing economic support for a digital library.

Infrastructure, social/community/mission – The non-technical and non-financial foundations of a digital library. These include the library’s mission and purpose, its designated community of users, and its role in society.

Infrastructure, Technological – The hardware, software, networking, and data-center facilities of a digital library.

Mirror Site – “On the Internet, a mirror site is an exact copy of another Internet site. Mirror sites are most commonly used to provide multiple sources of the same information.” http://en.wikipedia.org/wiki/Mirror_%28computing%29

OAI – The Open Archives Initiative. (http://www.openarchives.org/) Not to be confused with OAIS. “The Open Archives Initiative develops and promotes interoperability standards that aim to facilitate the efficient dissemination of content.” One standard OAI promotes is The Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) which is a “mechanism for repository interoperability.” It specifies a way for repositories to expose structured metadata about the contents of repositories. Others can then use the Protocol to harvest that metadata or the documents they describe.

OAIS – OAIS – Open Archival Information System (OAIS) is a document that describes the essential functions and components of a digital archive. It is widely used (Library of Congress, National Archives, RLG, Harvard, UK Data Archive, British Library, etc.) in the design and evaluation of of digital archives. GPO used it in designing FDSys. OAIS goes beyond “bit preservation.” An OAIS-compliant archive accepts the responsibility to ensure that information will be usable by a designated community.

PURL – Persistent Uniform Resource Locator, or purl, See “Purls vs handles” for a larger discussion.

XML – Extensible Markup Language (XML) is specification for creating custom markup languages intended for use on the Web. Like HTML, it allows text to be tagged or “marked up.” Unlike HTML, which focuses on appearance, XML allows content to be tagged to denote meaning. XML is generally human-readable and therefore more easily preserved than proprietary, binary formats. It is also designed so that it can be easily parsed by computers and so is often called “machine-actionable” because it makes it possible to more easily re-use and re-purpose content. An example of a XML being used for government publications is the XML version of the Federal Register. This has already prompted new uses of the FR at FedThread.org. FedThread (“a new way of interacting with the Federal Register”) uses the government-provided XML to create functionality that the government does not provide. This includes collaborative annotation, advanced search, customized feeds, and more.

Virtual Depository – This is a commonly used, but misleading term. Virtual depository is NOT digital deposit (See FGI post, “Toward a definition of ‘virtual depository'”). GPO has used the term to mean the substitution/negation of actual deposit of paper documents in a depository library’s collections for links in a library’s online catalog to digital documents housed on GPO servers. Virtual depository is then the antithesis of digital deposit.


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