Just a quick question. I know that a semi-hollow guitar changes the tone when compared to a solid-body, adding some "acoustic resonance" or whatever. But can it really be considered as separate from a solid-body as a hollow is from a semi-hollow? What I mean is that, in both a solid-body and a semi-hollow, the bridge and pickups are on a part of a the top that is connected to a piece of wood that is connected to the back, whereas a hollow is not. Therefore isn't it fair to say that the difference between a hollow and a semi hollow is MUCH MORE SIGNIFICANT than the difference between a semi-hollow and a solid-body, as opposed to the common statement that "semi-hollow straddles the line between hollow and solid-body"?

All I mean to say is that a semi-hollow may change the tone, but a hollow changes the way the tone is even produced.
Actually no...in all cases tone is produced by strings resonating, creating a magnetic field, and pickups turning that into an analog audio signal.
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Ok, I'll give you that. But surely if the bridge is allowed to actually cause the top to vibrate (which would be impossible with a center-block or on a solid-body), it would change the way the pickups receive the string's vibrations?
I think that's true. Hollowbodies definitely sound and respond very differently than semis. You can make a semi-hollow sound like a solidbody, but it's pretty tough to make a hollowbody do it.
Bridge vibrations certainly effect tone, and having the bridge on a solid piece will make a big difference as opposed to having it on the top of a hollowbody.

The last line of the OP I take issue with - the tone is still produced in the same way, unless you're using a piezo or a microphone. I'd say that the way the guitar resonates is very drastically altered, but the sound is still produced in the same way.
Uhh...the top still resonates on a semi-hollow.
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Sure, but the bridge transfers those vibrations. In a solidbody, it's a pretty straight shot from there to the rest of the guitar. With a hollowbody, there's all sorts of crazy stuff going on because the whole guitar is vibrating on its own a whole lot more and in much more nuanced ways than a solid chunk of wood. That's bound to effect how it sounds.