A brief summary or description of the essential content from the source document.


Broader Term

Broader terms are found in the Data Citation Index search aid. They are known to be wider in scope than the one selected. Only the terms one level wider are given. If a term has multiple broader terms, then more than one hierarchy will appear.


Data Set

A single or coherent set of data (or a data file) provided by the repository as part of a collection, data study, or experiment. These can be of multiple file formats such as spreadsheet, video, and audio. Data sets may have cited references or can be citable, but more commonly they inherit metadata of the overall study.

Example: Incident data


Data Study

A description of studies or experiments held in repositories with the associated data used in the data study. These are linked to a repository and may optionally link to Data Set records relating to the more granular data files. Data Studies can be a citable object in the literature and may have cited references attached in their metadata together with information on such aspects as the principal investigators, funding information, subject terms, geographic coverage, and other data.

Examples of Data Studies include:

  • Digital sky surveys in physics
  • Population census in the social sciences
  • Sea surface temperatures used in monitoring climate change
  • Cultural artifacts found at archaeological sites
  • And more ...

Example: Murder Cases in 33 Large Urban Counties in the United States, 1988



Descriptors are terms that are currently used in indexing product records.


DOI (Digital Object Identifier)

The Digital Object Identifier (DOI®) is a system for permanently identifying and exchanging intellectual property in the digital environment.

Example: DOI: 10.1134/S1061920808010020

See for more information.

DOI® is a registered trademark of the International DOI Foundation.

A DOI number can be associated with an article, a book, a book chapter, a data study document, and other document types.



Items in a library collection. For example, a library's online catalog would show whether the source publication is held in the library's collection.



The International Standard Book Number is a unique identifier that identifies a work's national, geographic, or language, along with the publisher, title, edition, and volume number. The format is a 10-digit number that contains 3 hyphens (-). The last digit is a check character, which may be a number or X. The position of the hyphens can vary for each ISBN. Example: 2-7380-1000-8



The International Standard Serial Number is a unique number that identifies the source publication. The format is four numbers, a hyphen (-), three numbers, and then a check character that may be a number or X. Example: 0002-9262



Keywords are words or phrases that describe the content of an article. They are provided by the author(s) of the source article. They are taken directly from source article and are identified as keywords in the source articles.


Marked List

A list of records that you marked from either the Results page or the Full Record page. Once you add records to the Marked List, you can later print, save, e-mail, order, or export some or all of those records. You have the option to select records from the Total Records table to output or you can select records from a specific product database.



Records in the Data Citation Index includes metadata such as:

  • Title
  • Authors
  • Source
  • Abstract
  • Year
  • Article number
  • DOI
  • Country
  • And more ...


Narrower Term

Narrower terms are found in the Major Concepts search aid. They are generally terms that are more focused in scope. Only the terms one level narrower are given. If a term has multiple broader terms, all narrower terms may not necessarily be in the same branch of the hierarchy. See also Broader Term.



A database or collection of records that stores and provides access to the data from Data Studies and Data Sets.

The records in the Data Citation Index provide access to the material held in repositories. Repositories can be a citable object in the literature and many have cited and citing references attached in their metadata.

Example: Interuniversity Consortium for Political & Social Research (ICPSR).


Scope Notes

Scope notes are found in the Data Citation Index search aid. They generally describe how a term or code is used and/or provide historical information about its use.


Search Aid

Search aids are tools that allow you to select predefined names, terms, or codes and automatically add them with the appropriate syntax to a search query. Search aids allow you to quickly and easily achieve consistent search results.


Set Combination

A set combination consists of two or more set numbers that you can run as a unique search query. For example, #1 AND #3 combines the results of set 1 and set 3 to form a single query. Set numbers appear under the Set column in the Search History table.

You can also enter a single set number alone to refresh the results of a previous search. In this instance, you may also want to change the timespan, languages, document types, literature types, and Taxa Notes.


Source Document

An article, patent, book, or other work represented by a record in the product database. May also be referred to as "source publication" or "source record".