MCS confusing questions

[bigclouds]

hi,
1. url http://danwalsh.livejournal.com/63472.html 
one place,  you said s0:c1,c2 can access 4 MCS. include s0:c1
but after a while. you said
 svirt_t:s0:c1,c2 would be able to read a svirt_tmp_t:s0:c1 file?
 
why?
 
2. why "svirt_t:s0:c1,c2 would be able to read a svirt_tmp_t:s0:c1 file", if it
is because s0:c1,c2 is higher level than s0:c1?
 
thanks