[selectors] Clarification needed for attribute selectors

Looking at 
<http://www.w3.org/TR/2005/WD-css3-selectors-20051215/#attribute-substrings>, 
I assume that the following four selectors are equivalent in terms of 
what they match?

[foo]
[foo^=""]
[foo$=""]
[foo*=""]

(With the literal empty strings there, yes.)

-Boris