Portland Common Data Model: Works Extension 2016-02-16 Ontology for a PCDM extension that adds subclasses of pcdm:Object to refine the relationships between a work and its constituent parts. Also establishes links to the IIIF Presentation API. 2021/04/09 Work A work or intellectual entity, such as a book, film, dissertation, etc. Works have member Objects representing their physical structure (e.g., pages in a book), FileSets to maintain representations of the entire resource (e.g. a PDF of all the pages), and TopRanges representing their logical structure or structures (e.g., sections and chapters in a book). FileSet A group of related Files, typically a single source File and any derivatives. TopRange A logical ordering of the component parts of a Work, corresponding to a IIIF Range with the "top" viewing hint. Has member Ranges that represent the logical structure, such as chapters within a book, scenes in a film, etc. Range A section of a Work, corresponding to a IIIF Range. Has member FileSets representing the physical parts of the Work are part of the section (e.g., which pages are in a chapter).