As they say about classifications and categorization: there are the lumpers and there are the splitters.
Here are my two cents as to technical digital cameras:
Monorail
The classical technical "studio" camera with a front standard holding the lens, a rear standard holding sensor, both standards having all movements, connected by a bellow and a monorail (monorail could be a flatbed). Both standards are moveable along the monorail but are not foldable. Not really practical for outdoor use in the film days, but may be for smaller digital versions. (Added 10/22: But there is a sub-group of 4x5" cameras - field monorails! - that is easily transportable and suitable for field use. For example, Linhof Technikardan, and the Toho FC-45X is the most compact and lightweight 4x5" camera I know.)
Pancake camera (called "pancake cameras" due to their flat appearance at the film days!)
A housing holds both the sensor and the lens, the lens being focused using helical focus mount. Best suited for very wide to normal focal length lenses. Good example are P1's XC cameras and ALPA cameras. Often designed for hand-held use.
Flatbed camera
No monorail but a flatbed. Both standards can be folded down onto the flatbed for easy transportation and storage. Practical for outdoor use. Nice example,
http://svedovsky.com/11x14-camera/. Don't recall having seen yet a digital flatbed camera.
Technical field camera
The rear standard is fixed or integrated to flatbed (Linhof Techno) or rail (Silvestri Flexicam), hence no rear tilt or swing movements (but both examples have horizontal rear shift), any tilt or swing movements must be via the front standard. Not foldable.
P.S. My dream camera would be a sized-down Linhof Techno, from 6x9 to 645 format, with just enough extension for Digaron-S 180mm.