ERDL file for a simple blog

blog.erdl

package org.uos.nhaldenw [ db_name ] {
        entity User {
               name: String
               age: Integer
               size: Float
               admin: Boolean
        }

        entity Group {
               name: String
               description: String
        }

        entity Address {
               street: String
               number: Integer
               zipCode: Integer
        }

        entity Post {
               title: String
               text: String
        }

        entity Category {
               name: String
               description: String
        }

        entity Comment {
               text: String
        }

        rel User => Post {
            User as Author
        }

        rel Post => Comment

        rel Category => Post

        rel User -> Address

        rel User <=> Group

        rel User => Comment {
            User as Author
        }
}