Baseline and Relative Prosodic Attributes

quote:
"...
Relative changes in prosodic parameters should be carried across voice changes. However, different voices have different natural defaults for pitch, speaking rate, etc. because they represent different personalities, so absolute values of the prosodic parameters may vary across changes in the voice.
..."
if I understand that, the synthesis processor must make the difference between, for example, baseline pitch change and relative pitch change? 
In the "prosody" element: when you change your pitch by
- a number followed by "Hz",  you change the baseline pitch
- and a relative change or "x-low", "low", "medium", "high", "x-high", or "default", you change the relative pitch.
Is It right?
If it is, does a baseline change in a "prosody" element cancel previous relative change?

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