Portland Common Data Model 2015-09-28 Ontology for the Portland Common Data Model, intended to underlie a wide array of repository and DAMS applications. 2015/09/28 Administrative Set An Administrative Set is a grouping of resources that an administrative unit is ultimately responsible for managing. The set itself helps to manage the items within it. An Object or Collection may be contained by only one AdministrativeSet. Collection A Collection is a group of resources. Collections have descriptive metadata, access metadata, and may links to works and/or collections. By default, member works and collections are an unordered set, but can be ordered using the ORE Proxy class. Object An Object is an intellectual entity, sometimes called a "work", "digital object", etc. Objects have descriptive metadata, access metadata, may contain files and other Objects as member "components". Each level of a work is therefore represented by an Object instance, and is capable of standing on its own, being linked to from Collections and other Objects. Member Objects can be ordered using the ORE Proxy class. Alternate Order An AlternateOrder is an alternate ordering of its parent's members. It should only order the parent's members, and otherwise has all of the features of ordering (some members may be omitted from the order, members may appear more than once in the order, etc.). File A File is a sequence of binary data and is described by some accompanying metadata. The metadata typically includes at least basic technical metadata (size, content type, modification date, etc.), but can also include properties related to preservation, digitization process, provenance, etc. Files MUST be contained by exactly one Object. has file Links to a File contained by this Object. is file of Links from a File to its containing Object. has member Links to a subsidiary Object or Collection. Typically used to link to component parts, such as a book linking to a page. is member of Links from an Object or Collection to a containing Object or Collection. has related object Links to a related Object that is not a component part, such as an object representing a donor agreement or policies that govern the resource. is related object of Links from an Object to a Object or Collection that it is related to.