With the December 18 issue Nature started to support XMP markup in article PDFs (reported last week on the Nascent blog by Tony Hammond)1. XMP stands for Extensible Metadata Platform and is a technology to embed metadata in files, including PDFs2. XMP was created by Adobe (with XMP support in PDF files since 2001), but is an open standard with backing by others, including Creative Commons3. The Digital Object Identifier (DOI) is the most important piece of information in the metadata, as the DOI provides a link to the journal publisher website where more metadata can be retrieved. XMP support in scientific PDFs is unfortunately still very uncommon and probably hasn't changed much since Pierre Lindenbaum checked last year4.
This is a companion discussion topic for the original entry at https://front-matter.io/mfenner/just-doi-it