Alligator reads a item name, its XYZ values of a CA, its start and end date and the fact if it is fixed or not, example here.
Out of the CA
3D data all 3D distances are calculated. For items which are not fixed (floating) the "next fixed neighbour" (NFN) for start or end date will be searched. If the NFN is found, the virtual year will be taken. With this result and all new
"virtual" years, all Allen time intervals will be calculated. As a key feature, this calculation is downloadable als Ressource Description Framework (RDF) file, following the alligator ontology.