yeah.erdl

package org.uos.nhaldenw [ database ] {
  entity User {
    first_name: String
    last_name: String
    post_count: Integer
  }

  entity Adress {
    street: String
    number: Integer
    post_code: Integer
    country: String
  }

  entity Post {
    title: String
    body: String
    published_at: Date
  }

  entity Group {
    name: String
  }

  rel User => Post {
    User as Author
    Post as BlogPost
  }

  rel User <=> Group {
    User as Member
    generate: true
  }

  rel User -> Adress

}