Thomas D. Wason: Glossary for Metadata, Taxonomies & Digital Libraries

Aggregate: To collect or gather together.
Assessment: "Any systematic method of obtaining evidence from tests, examinations, questionnaires, surveys and collateral sources used to draw inferences about characteristics of people, objects, or programs for a specific purpose." from the Testing and Assessment Glossary of Terms of QuestionMark: http://www.questionmark.com/us/glossary.htm. (Contributed by Eric Shepherd).
Authority List: A controlled list of terms, names, phrases or similar entries relative to a specific domain or scope. An authority list may or may not contain defintions or other information about each item. A glossary or dictionary contain defintions. Typically an authority list provides the standard spelling and form of terms. Authority lists have defined managers, e.g., the British Library's Name Authority List (http://www.bl.uk/services/bibliographic/authority.html). Authority Lists may have structure, such as the hierarchy of the Library of Congress' Subject Headings: http://www.loc.gov/cds/lcsh.html
Category: A selection, subset or subdivision of a classification. See also Dr. Tom’s Classification Guide
Catalog: "A database which contains descriptions of information resources and their locations," Pipher, Hayes & Davis (1998).
Classification: "1 : the act or process of classifying
2 a : systematic arrangement in groups or categories according to established criteria; specifically : TAXONOMY b : CLASS, CATEGORY "* Classification is both the systematic arrangement of labels and the application of those labels. Dr. Tom’s Classification Guide http://diicoe.disa.mil/coe/index.html
COE: Common Operating Environment: http://diicoe.disa.mil/coe/index.html. See also Robin Cover's U.S. Federal CIO Council XML Working Group Issues XML Developer's Guide: http://xml.coverpages.org/ni2002-01-16-a.html.
Concept: 2 : an abstract or generic idea generalized from particular instances * See Note on Subjects and Concepts.
Collection: A collection is an aggregation of resources. It may—or may not—all be packaged in one resource or content package. It has no inherent navigational structure. It may have an index and/or table of contents. Items may be accessed on an individual basis. An example is a collection of images. A collection may be housed in a library or repository. Most collections have a theme.
Community: A group with one or more common interests. The European SchoolNet has many learning communities supported by tools.
Content: A specific kind of resource that is packaged into a usable state. A document is content.
Content Package: An assemblage of content items and possible support files or headers. Support files may include a manifest and/or sequencing files or sections.

Data Set: An organized collection of data.
Data Base: A software structure that contains one or more data sets. A data base that holds one data set may make the two seem to be one and the same. A data base is an application or tool, it is not its contents. Question: do we consider the technical metadata to refer to the data set or the data base?
Dictionary: An organized collection of definitions and uses of terms. A term may have more than one definition and more than one use. Contrast with glossary, thesaurus and taxonomy.
Digital Library: "[N]etworked information in the research and education communities." "[Digital] Libraries... [are] ...technological and social developments that are fueled by information technology, bioinformatics, and networked information." http://www.cni.org/, http://www.diglib.org/dlfhomepage.htm. DLESE is an example of a digital library within the NSF's NSDL.
Directory: "[An] alphabetical or classified list (as of names and addresses)".* A directory is simple and flat, usually providing a set of name - location pairs.
DTD: Document Type Definition for describing an XML structure: http://xml.coverpages.org/XMLSpecDTD.html. XML-Schemas allow richer descriptions at the price of complexity.
Dublin Core (DC): The Dublin Core Metadata: http://dublincore.org/. A core set of 15 elements or fields that are used to describe resources. It is a widely used basic system of metadata good for wide area searching. Often expressed as HTML metatags. Sometimes "qualifiers" are added to refine the definitions of each field. When in doubt, DC is a good starting place for metadata, as it is widely used. DC is implemented with a variety of technical formats. DC is compatible with Z39.50, as DC defines descriptive labels and Z39.50 describes technical formats and transmission protocols.
Element: A component in a metadata structure. Each element has a token.
Extension: To go beyond the original form. For instance for XML see Dr. Tom’s Guide to IMS XML Extensions and Incorporations

Field: A hole in a metadata structure into which appropriate values are placed. This is not to be confused with an element. The simplest metadata field is a metatag.
Glossary: A list of terms with single definitions with respect to a particular domain. "[A] collection of ... specialized terms with their meanings".* Contrast with dictionary, thesaurus and authority list.
Granularity: Level of graininess or size.
The IEEE LTSC: Institute of Electrical and Electronic Engineers' Learning Technology Standards Committee : http://ltsc.ieee.org/
IMS Global Learning Consortium: "IMS Global Learning Consortium, Inc. (IMS) [is a non-profit corporation that] is developing and promoting open specifications for facilitating online distributed learning activities such as locating and using educational content, tracking learner progress, reporting learner performance, and exchanging student records between administrative systems. " These are busy people. http://www.imsglobal.org/
ISO 11179: Standard for describing data elements used in databases and documents: http://www.diffuse.org/meta.html#ISO11179. Sponsoring body: ISO/IEC JTC1/SC32. As an example implementation see the Australian Institute of Health and Welfare Data Standards: http://wason.home.mindspring.com/TDW/Australian%20Institute%20of%20Health%20and%20Welfare.
Item: A unit or resource of arbitrary size.
Knowledge Management (KM): An organizational process for converting information into knowledge and making that knowledge accessible. It is more a state of mind and a committment than a specific set of tools. Tools are used, however. See Brint: http://www.brint.com/km/. KM and online learning are merging in some enterprises.
Learning Object: The term "learning object" has a variety of definitions. I prefer a broad definition: a package of one or more resources that have educational utility. I am not going to try to specify "educational utility"; that is in the eye of the beholder, so to speak. Sometimes the definition states that the object must be specific for learning. Sometimes there is a requirement for an assessment component. The variety of definitions makes use of the term "learning object" unreliable without reference to a specific defintion.
LOM: The Learning Object Metadata standard of the IEEE LTSC. The IEEE LTSC working group is #12: http://ltsc.ieee.org/wg12/index.html.
Manifest: A packing slip for a content package. A manifest in a content package may contain or point to metadata, define the resources contained in the content package and define an intended organization of the resources.
Memetics: The study of evolution in information systems, c.f. Journal of Memetics - Evolutionary Models of Information Transmission, http://pespmc1.vub.ac.be/MEMES.html, http://aleph.se/Trans/Cultural/Memetics/or An Evolutionary Model of a Data System (Wason)
Metadata (bibliographic): Information that catalogs or describes a resource. This may include metadata defining the resource subject, format, location, ownership, authorship and so forth. Some may validly consider metadata a resource. See also Dr. Tom’s Metadata Guide, Wason, T., and Wiley, D. (2001). "Structured Metadata Spaces".
Metatag: A named field. Typically metatags are not structured, but are used as a simple name-value pair datum. Metatags a normally associated with HTML as <meta> elements in the header. See for example the Meta Tag Tutorial at WebDeveloper.com. Some web search engines use the metatags, some do not.
MIME: Multipurpose Internet Mail Extensions. Generally accepted designations of file format types. MIME is an example of a recommended standard that has not yet been approved but is widely used. This is an example of how the world works at "Web speed.". If you wait for the formal standard before proceeding, you may be left at the back of the pack. On the other hand, if you select a recommendation that is either not approved or undergoes significant change before approval, you may have a lot of expensive revision to do. Enterprises participate in standards groups to try to discern the future.
NSDL: The National Science Foundation's National SMET Digital Library Initiative: NSF NSDL.
OAI: Open Archives Initiative: http://www.openarchives.org/ The OAI has developed a metadata harvesting protocol. This is used in the NSDL and elsewhere.
OKI: Open Knowledge Initiative: http://web.mit.edu/oki/
Ontology: 1 : a branch of metaphysics concerned with the nature and relations of being * See Note on Subjects and Concepts.
Perceptual Coupling: Matching the nature or structure of information to the precognitive processing of the human perceptual system to promote the rapid recognition or meaning of information. Perceptual coupling has a variety of applications generally involving situation management.
Qualifier: Refines or limits the definition of a metatag. DC provides qualifiers.

RDF: Resource Description Framework of the W3C: http://www.w3.org/RDF/. Uses XML for a self-describing data structure system.
Registry: Information that defines what is stored in one or more repositories. It may contain specialized vocabularies and taxonomies. A "registered" repository may have to adhere to certain rules in order to be registered. See for example: http://diides.ncr.disa.mil/xmlreg/user/index.cfm.
Repository: A storage site for resources, including metadata. A repository may house a collection. Contrast with a registry or a collection.
Resource: Any asset that can be bounded in some manner. It may be a data stream, but its parameters are well defined. Content, data sets and data streams are resources. A tool may be considered a resource. A source of supply or support.* Stuff.
SCORM: Sharable Content Object Reference Model http://www.adlnet.org/
Semantics: The study of meanings: a : the historical and psychological study and the classification of changes in the signification of words or forms viewed as factors in linguistic development.*
Semantic Web: The gleam in Tim Berners-Lee's eye for a unified Web without metadata: http://www.w3.org/2001/sw/
SMET: An acronym for Science, Mathematics, Engineering and Technology, sometimes with "
Education" included at the end.
Specification: "a detailed precise presentation of something or of a plan or proposal for something -- usually used in plural".* A specification is created by an enterprise, as opposed to a standard, which is maintained by an official body. For example the IMS Global Learning Consortium and Intel develop specifications. Examples are the IMS Meta-Data Specification and the Intel Audio Codec Specifications.
Standard: "[S]omething set up and established by authority as a rule for the measure of quantity, weight, extent, value, or quality ".* IEEE and ISO develop standards. An example is the IEEE LTSC Learning Object Metadata standard (under ballot). Recommended, but not yet approved, standards such as MIME are widely used. Not yet approved standards may be designated RFC (Request for Comments).
Subject: 3 a : a department of knowledge or learning * See Note on Subjects and Concepts.

Tag: See Metatag.
Tautology: A self referential definition or system of logic. See tautology.
Taxonomy: A structured vocabulary that embodies relationships among terms. Each term is contained in a taxon. The most common relationship is a hierarchy (tree structure). Other forms may include cross linking and poly-hierarchical structure. A vocabulary is a single level taxonomy. See also Dr. Tom’s Taxonomy Guide. Some major taxonomies are: MARC, LCSH, MeSH. For a long list of many taxonomies in many domains see: Controlled vocabularies, thesauri and classification systems available in the WWW. DC Subject (http://www.lub.lu.se/metadata/subject-help.html) Originally referred to biological classifications: "[O]rderly classification of plants and animals according to their presumed natural relationships".* Compare with thesaurus.
Taxon: A node in a taxonomy. A taxon may contain a term, and reference label and links to other taxons.
Thesaurus: A collection of terms, their definitions (that may be multiple) and relationships to other terms. Contrast with taxonomy, dictionary and glossary. " [A] list of subject headings or descriptors usually with a cross-reference system for use in the organization of a collection of documents for reference and retrieval".*
Token: An element's name or set of characters that are the logical equivalent of a name.
Vocabulary: A list of terms, sometimes with definitions. A single level taxonomy. A vocabulary can be considered a very localized glossary. Or not.

XML: eXtensible Markup Language of the World Wide Web Consortium: http://www.w3.org/TR/REC-xml. A method for serializing structured data for use on the Internet. This is not yet an official standard, but is in a "recommended" state. See also http://www.xml.org/.
XML-Schema: A control system for XML: http://www.w3.org/XML/Schema. This is not yet an official standard, but is in a "recommended" state. See Dr. Tom’s Guide to XML-Schema , IMS XML bindings, DTDs and Examples.http://www.imsglobal.org/xsd/.
XSL: The Extensible Stylesheet Language for creating different views of XML documents: http://www.w3.org/Style/XSL/.
XSLT: The Extensible Stylesheet Language for Translating XML documents to different formats: http://www.w3.org/Style/XSL/. This is part of the XSL specification.
Z39.50: " A technical data format and transmission protocol specification. "Z39.50" refers to the International Standard, ISO 23950: ’Information Retrieval (Z39.50): Application Service Definition and Protocol Specification‘, and to ANSI/NISO Z39.50. The Library of Congress is the Maintenance Agency and Registration Authority for both standards, which are technically identical (though with minor editorial differences).
"The standard specifies a client/server-based protocol for searching and retrieving information from remote databases. " http://www.loc.gov/z3950/agency/

This glossary has been prepared by Thomas D. Wason. Some definitions are taken from the Merriam-Webster Online Dictionary at http://www.m-w.com/dictionary.htm. If multiple definitions are available, the most appropriate one is selected. Entries from the Merriam-Webster Online Dictionary are designated with an asterisk (*).

Glossary of Terms for Metadata, Taxonomies and Digital Libraries

Glossary of Terms for Metadata, Taxonomies
and Digital Libraries