xcdatamodel - relationship to same entity

[andue]

hi,

hopefully i did search well before posting now, but couldn't find anything that would help.

I'm using core data with sqlite and have a list of schools. klicked on a school, i get a more detailed view for the school. that's the part that is working

now i want in the detail view, links to other schools (that are in the list as well), so school1 could have a link to school 2,3 and 4 / school 2 links to 3 and 5... (see picture2)

i haven't found out how to model that... i think it might be a relationship to itself, but couldn't get it working... (see picture 1)

anyone a idee how this could work?

thanks a lot.

picture1:
picture2: