DET, or "DAV Extension Type"
is short for DAV Extension Type
DETs are a means of programmatically creating WebDAV
collections and resources from DBMS data (Relational, Graph, or otherwise) on the fly (i.e., actual content is computed at run time).
This is the mechanism used by ODS Briefcase to expose data from the following SQL-based applications as URL locatable resources, for example:
ODS Feed Manager
ODS Bookmark Manager
This is also the mechanism that enables URI referencing of SQL Data via WebDAV for RDF Triple Statement construction.