Nature Subject pages are pages that dynamically aggregate content from across Nature.com based on the tagging of that content by NPG subject ontology terms.
In a nutshell, the goal of the project was to help nature.com readers discover content more easily by using an internally-developed subject ontology to publish a page per term. The ontology is actually a poly-hierarchical tree of scientific topics, which has been used in the last couple of years to tag all articles published on nature.com.
Besides helping users browse the site more easily, these pages make NPG content more discoverable via Google and other external search engines. All of this powered by a new backend platform which combines the expressiveness of linked data technologies (RDF) with the scalability of more traditional XML data stores (MarkLogic).