The <timeLine> element allows us to talk about something which takes place over a period of time, and lets us
talk about points within that period, using <when>. However, this does not let us talk about _chunks_ of the timeline.
I'd like to use such a thing to link a text to an audio or video rendering of it (a performance of a play, for example). Thus
I have a poem with 8 lines, and 60 seconds of audio of the poet reading it. I'd like to note that line 2 can be linked to the
audio, the point between 8 seconds in and 15 seconds in. I have in the past abused <when> by adding @from/@to attributes
to it, which works fine, but it would be good to have this done cleanly. One _could_ define stretches of time by defining <when>s for the start and
the end, but this is cumbersome, and does not provide a unit to link to.
My suggestion is to add a new empty element <chunk> or <stretch> or <anothername>, which can occur as a child of <tlmeline>, freely
interspersed with <when>s, and with attributes @from, @to, and @unit.
I'd also be just as happy if <when> was re-defined to allow us to talk about stretches of time, by adding @from and @to.