Tony Hammond from Elsevier has announced a PRISM module for RSS 1.0, and provided some example data feeds, including one for Nature.
PRISM, Publishing Requirements for Industry Standard Metadata, defines a vocabulary for syndicating, aggregating, post-processing and multi-purposing magazine, news, catalog, book, and mainstream journal content.
Hammond writes that their RSS/PRISM feeds "demonstrate how the PRISM terms enable us to publish a full magazine table of contents as RSS/RDF. We expect that there will be other applications that can make use of this rich metadata term set."
Demonstrations of test data include a Nature feed, a Tetrahedron feed, and an HTML demo rendering of that feed.