Four-layered Content Architecture
This term describes the approach of dividing digital content and its meaningful and effective storage, tagging, maintenance and application into four layers: The content layer, the metadata layer, the semantic layer and the navigation logic. To differentiate these layers makes it easier to develop applications based on the content thus structured and handled.The four-layered content architecture decouples navigation logic from metadata and introduces explicit semantics. When based on expressive data models like RDF and SKOS, the semantic layer can serve for data integration and as a single point of access to heterogeneous data sources. Decoupling navigation logic from metadata and from content assets at all, instead being linked to the conceptual model (semantic layer) of a domain, offers new and more dynamic ways to create navigation structures on a web site, for a web shop, or any enterprise information system.