There is no such thing has a semi SLR.
A DSLR stands for Digital Single Lens Reflex,even cameras like the NEX-5 or M4/3 cameras are not a DSLR,since there is no reflex of the image and lack the mirror.But they all fall in to the category of Interchangeable Lens Camera or ILC these camera have much larger sensors then the p&s,ultra zoom,prosumer cameras(except pentax Q) .So they can take better quality photos and are also significantly faster at focusing,shot to shot etc.
The semi SLR as they some call it are nothing but your regular point and shoot cameras with more controls or has a higher tele zoom lens some also call them a prosumer camera like canon G12,nikon P7100 ,fuji X10 .
The ultra zoom cameras like canon SX30is /SX40HS,nikon P500 /P510 ,Sony HX100v ,fuji HS20 and X-S1 .