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Google updated the Article structured data documentation to reflect that Article markup is open to all types of pages (as announced in 2020 with the page experience update).
Google added a new recommended property of author.url, which allows you to specify a link to a web page that uniquely identifies the author of the article, such as a social media profile or a bio page on the website. This author URL acts as a node identifier, and allows Google to disambiguate the correct author of the article.
On their Article structured data documentation, Google updated the required properties for AMP pages, to clarify that publisher.logo can be either a URL or ImageObject, and added examples for each.
Note that the requirements themselves have not changed, it is just a clarification to more accurately reflect that they understand both raw URLs as well as ImageObject markup.
Clarified that there are different Article requirements for AMP and non-AMP pages. Added an example of a non-AMP page with Article structured data.
Updated the AMP logo guidelines to clarify that the file format must be supported by Google images.
Added a note to differentiate between guidelines applicable to Article AMP logo guidelines and generic Logo guidelines.
Google's RRT now works with Article structured data on AMP pages. Documentation also updated, removing the following recommended fields: description, publisher.logo.height, publisher.logo.width.