The ´miştir´ ending is an ending in its own right.  You use it when you are not sure that something has happened or not.

Ok sonunda,i checked my book,i rememberd its a rule,but not just with mIş

İts Tahmin

And it can be with -yor,-mış,-acak

eylem +yor,mış,acak +kişi +dIr

And also its used with ad/sıfat...nouns and adjectives

ad/sıfat + dIr

And the other usage is what i said above with ilanlar ´advertisements´

OK-thanks.

Actually thank you for making me go through my book and reminding me.

 so does hatunum means my wife?