csprd03 - Core specification overview text

In the section "4 The Core Specification" the 3rd paragraph states:

[[
... Each <file> element contains a set of <unit> elements that contain the text to be translated in the...]]

That's not quite correct anymore: a <file> can contain a single <group> that can be empty. So *each* <file> does not necessarily
have <unit> elements.

I suggest to change the text to:

"Typically, each <file> element..." or "Typically a <file> element..." or something similar that is less absolute than the current
text.


-yves