| Code | Display | Definition |
| abstract |
Abstract |
URL to reach the abstract for the article. |
| abstract-version |
Abstract Version |
URL to reach a specific version of the abstract for the article. |
| doi-based |
DOI Based |
URL derived from DOI. |
| full-text |
Full-Text |
URL to reach the full-text of the article. |
| full-text-version |
Full-Text Version |
URL to reach a specific version of the full-text of the article. |
| pdf |
PDF |
URL to reach the full-text of the article in PDF form. |
| pdf-version |
PDF Version |
URL to reach a specific version of the full-text of the article in PDF form. |
| webpage |
Webpage |
Used when URL type is a webpage, but other codes do not apply. |
| not-specified |
Not Specified |
Used when URL type is not specified, commonly when only a single URL is provided. |
| json |
JSON |
URL to reach computable content in JSON format. |
| json-version |
JSON Version |
URL to reach a specific version of computable content in JSON format. |
| xml |
XML |
URL to reach computable content in XML format. |
| xml-version |
XML |
URL to reach a specific version of computable content in XML format. |
| supplement |
Supplement |
Supplement |
| supplementary-file-directory |
Supplementary file directory |
Supplementary file directory |
| compressed-file |
Compressed file |
Compressed archive file (e.g. a zip file) that contains multiple files |