Resource Description Framework (RDF) is the descriptive data format used by the ARC nodes to define and display digital objects within any given resource. RDF, an XML metadata format used to describe resources semantically, easily enables the archiving, sustaining, and sharing of resources on the web. The ARC RDF schema provides a comprehensible set of required and additional elements that contributing resources can use to create interpretive values to describe their digital objects. While basic features (e.g. title and date of composition) are required, additional choices (e.g. hierarchical elements) are provided so that resources may choose to create either simple or complex descriptive frameworks for resources. More information on what our required elements are, what the ARC RDF schema looks like, and what optional elements are available to define a digital object can be found on the Collex Wiki.