Confusion about global and local names/ids of capability in the source code

Hello,

I was reading the codes about capabilities, and I found this, which is suspected as a conflict in my understanding.

1) In Cap_index class, we have an id, which is commented as global capability id:

class Cap_index { ...blah uint16_t _id; /* global capability id */ ...blah };

2) But in Native_capability class, there is something like this:

class Native_capability { ...blah int local_name() const { return _idx ? _idx->id() : 0;} ...blah };

here, the id of Cap_index (i.e., commented as global capability id) is returned as local_name. I think it is a conflict or do I miss something? Please enlighten me about this.

Best, Jaeyong