So basically now , um , this is actually  this little change actually goes along with a big linguistic change , which is that " designates " isn't only something for the semantics to worry about now.
Good.
So we want s " designates " to actually know one of the constituents which acts like a head in some respects but is sort of , um , really important for say composition later on. So for instance , if some other construction says , you know , " are you of type  is this part of type whatever " , um , the " designates " tells you which sort of part is the meaning part. OK , so if you have like " the big red ball " , you know , you wanna know if there 's an object or a noun. Well , ball is going to be the designated sort of element of that kind of phrase.
Mmm.