| Code | Display | Definition |
| abstract |
Abstract |
The URL will reach a brief summary for the article. |
| full-text |
Full-Text |
The URL will reach the full-text of the article. |
| supplement |
Supplement |
The URL will reach a supplement, appendix, or additional supporting information for the article. |
| webpage |
Webpage |
The URL will reach a webpage related to the article, where the content is not easily classified as abstract, full-text or supplement. |
| file-directory |
File directory |
The URL will reach a file directory. |
| code-repository |
Code repository |
File archive and web hosting facility for source code of software, documentation, web pages, and other works. |
| restricted |
Restricted |
The URL content has restricted access (e.g. subcription required). |
| compressed-file |
Compressed file |
Compressed archive file (e.g. a zip file) that contains multiple files |
| doi-based |
DOI Based |
The URL is derived from the Digital Object Identifier (DOI). |
| pdf |
PDF |
The URL will reach content in PDF form. |
| json |
JSON |
The URL will reach content in JSON format. |
| xml |
XML |
The URL will reach content in XML format. |
| version-specific |
Version Specific |
The URL will reach content that is a specific version of the article. |
| computable-resource |
Computable resource |
The URL will reach content that is machine-interpretable. |
| not-specified |
Not Specified |
Used when URL classifier is not specified but expected in a system. |