Unclear sentence in 2.1.1 of ODF 1.0

["MURATA Makoto (FAMILY Given)" <eb2m-mrt@asahi-net.or.jp>]

The first value of text:display is defined as follows:

	value
		this value displays the value of the field. Some fields
		do not support this value. In these cases, the
		text:display attribute only takes the values 
		value or none, and value or formula, respectively.

First, what does "these cases" mean?  The cases that fields do not 
support this value?  Second, what does "respectively" mean?  
I guess that there are two cases.  In the first case, the permissible 
values are value or none; in the second case, they are value or formula.  
But I have no ideas about what the two cases are.

I have the same question about the second value of text:display, namely
formula.

Regards,

-- 
MURATA Makoto (FAMILY Given) <EB2M-MRT@asahi-net.or.jp>