10. a a
b c vs b c
comp a { comp a {
comp b; sons : b,c;
comp c; }
} comp b {
father : a;
}
comp c {
father : a;
}
11. ╥
φ
Select *
imt phd students from students,schools
where students.school
= schools.id
and ...
12. my system does always …
my sytem does … before …
some component of my system is s.t....
all components of my system are s.t....
some component always does … before...