On Wikimedia Commons, a lot of metadata (including license and author) are not machine readable. There is an API module, iiprop=extmetadata which can be used to retrieve some values (example), but as the information is entered as free text into the file description page itself, this is not perfect. The ongoing Structured data on Commons project aims to move the metadata as fully-structured data and will eventually supersede the machine-readable data presented in this page.

In the meantime, and to ease a transition towards more structured data at a future time, Wikimedia Commons use a set of standard templates which have been made machine-readable in some ways, through HTML elements. Some scripts already make use of that. It is worth noting that this data is available for any wiki using Wikimedia Commons, where it can be read from the html of the File: page just as other local data.

• Do NOT use HTML id's, use classes. An ID can only be used once per page and most of these fields can occur multiple times per page. Consider for instance descriptions of derivative works, which can include information about the original and the derivative.

• When possible, wrap the actual data, not some field header. This last method is historically used for all our Information templates, but much harder to support in the long run.

• Wrap data, not the way the data is formatted.
• Expect that formatting is lost when converting to data. Visual dress up is not part of the information.

• Don't wrap multiple units of information inside one field. There is a difference between a publication date and a creation date. Both are dates, but both are different 'data fields'. Also CC BY-SA-4.0-3.0-2.5 is not a license name, those would be 3 licenses with the name CC BY-SA-##.
• Make sure that the data value has one unit, or outputs one consistent unit.

There are a few things that are currently NOT or badly recognizable. These include:

• Derivative works
• Works included in works. See also Category:FoP_templates
• licenses derivates or works included in works are a mess.
• Author vs. Copyright holder
• usernames vs 'real names'
• Catalogue IDs etc
• VRTS permissions
• Publication date vs creation date

• Donating institutions of materials
• Anything that is NOT using the above structures is not recognizable at all and will require manual cleanup at some point.
• Heirs: {{Heirs-license}}
• Multilicensed CC works, that use {{Cc-by-3.0,2.5,2.0,1.0}}, {{Cc-by-sa-2.5,2.0,1.0}}, {{Cc-by-sa-4.0,3.0,2.5,2.0,1.0}} or {{Cc-by-all}}.
• Non-licensed works: {{Copyrighted free use}}, {{Attribution}} (Problem, how to describe this grant of rights success ?)
• Improvised File description templates like User:Tevaprapas/Information
• Templates denoting the copyright of partials of the work: {{Copyright information}}