Concept object
Last updated
Last updated
These are the original OpenAlex Concepts, which are being deprecated in favor of . We will continue to provide these Concepts for Works, but we will not be actively maintaining, updating, or providing support for these concepts. Unless you have a good reason to be relying on them, we encourage you to look into instead.
These are the fields in a concept object. When you use the API to get a or , this is what's returned.
ancestors
List: List of concepts that this concept descends from, as objects. See the for more details on how the different layers of concepts work together.
cited_by_count
Integer: The number citations to works that have been tagged with this concept. Or less formally: the number of citations to this concept.
For example, if there are just two works tagged with this concept and one of them has been cited 10 times, and the other has been cited 1 time, cited_by_count
for this concept would be 11
.
counts_by_year
Years with zero citations and zero works have been removed so you will need to add those back in if you need them.
created_date
description
String: A brief description of this concept.
display_name
String: The English-language label of the concept.
id
String: The OpenAlex ID for this concept.
ids
Object: All the external identifiers that we know about for this concept. IDs are expressed as URIs whenever possible. Possible ID types:
wikipedia
(String: this concept's Wikipedia page URL)
image_thumbnail_url
image_url
String: URL where you can get an image representing this concept, where available. Usually this is hosted on Wikipedia.
international
display_name
(Object)
value
(String): display_name
in the given language
level
related_concepts
score
(Float): The strength of association between this concept and the listed concept, on a scale of 0-100.
summary_stats
Object: Citation metrics for this concept
While the h-index and the i-10 index are normally author-level metrics and the 2-year mean citedness is normally a journal-level metric, they can be calculated for any set of papers, so we include them for concepts.
updated_date
wikidata
works_api_url
String: An URL that will get you a list of all the works tagged with this concept.
We express this as an API URL (instead of just listing the works themselves) because there might be millions of works tagged with this concept, and that's too many to fit here.
works_count
Integer: The number of works tagged with this concept.
DehydratedConcept
object[`display_name`](concept-object.md#display\_name)
[`id`](concept-object.md#id)
[`level`](concept-object.md#level)
[`wikidata`](concept-object.md#wikidata)
List: The values of and for each of the last ten years, binned by year. To put it another way: for every listed year, you can see how many new works were tagged with this concept, and how many times any work tagged with this concept got cited.
String: The date this Concept
object was created in the OpenAlex dataset, expressed as an date string.
mag
(Integer: this concept's ID)
openalex
(String: this concept's . Same as )
umls_cui
(List: this concept's )
umls_aui
(List: this concept's )
wikidata
(String: this concept's . Same as )
String: Same as , but it's a smaller image.
Object: This concept's display name in many languages, derived from article titles on each language's wikipedia. See the for "Java Bytecode" for example source data.
key
(String): language code in format. Full list of languages is .
Integer: The level in the concept tree where this concept lives. Lower-level concepts are more general, and higher-level concepts are more specific. has a level of 0; has a level of 5. Level 0 concepts have no ancestors and level 5 concepts have no descendants.
List: Concepts that are similar to this one. Each listed concept is a object, with one additional attribute:
2yr_mean_citedness
Float: The 2-year mean citedness for this source. Also known as . We use the year prior to the current year for the citations (the numerator) and the two years prior to that for the citation-receiving publications (the denominator).
h_index
Integer: The for this concept.
i10_index
Integer: The for this concept.
String: The last time anything in this concept object changed, expressed as an date string. This date is updated for any change at all, including increases in various counts.
String: The for this concept. This is the for concepts.
The DehydratedConcept
is stripped-down object, with most of its properties removed to save weight. Its only remaining properties are: