If you are questioning whether such properties are really "hard" today, that
is, whether they do not in fact allow for alternative display or
interpretation as, say, sound, then I think the answer is "yes" - out of the
box, Emacs does not allow for any alternative treatment for such properties:
:underline always means "underline". The :underline text property simply
determines whether or not the text in question is underlined. From Info:
That's right.
If you want something to underline in certain circumstances and do other
things in other circumstances, the way to do that is to define a face
with a conditional definition.
In particular, I wanted to distinguish link text from underlined text. Just
because some text might be underlined does not make it a link. To be a link,
it must behave as a link. I suggested we provide a way to make a portion of
text appear as a link - in whatever way that appearance might be manifested.
It is useful to have one way to say "make this text look like a link",
and the right way to do it is by defining a face called `link' and using
it in those places.
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