Does this " IN " make a difference

[jeff donovan]

zone "myfoo.org" IN {
		type master;
		file "myfoo.db";
};

zone "myfoo.org"  {
		type master;
		file "myfoo.db";
};

in  my old bind 8.2.3 zone file there are no "IN"'s but in 9.2.2 there
are. i have referenced my dns & bind book and I see lower case "in".
???
Can someone clarify this for me?

TIA

--jeff

-----------------------------------
jeff donovan
basd network operations
(610) 807 5571 x41
AIM  xtdonovan