created list, interface etc.

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/ContactDiaryElement.kt

+package de.rki.coronawarnapp.contactdiary.model
+
+import java.time.Instant
+
+interface ContactDiaryElement {
+
+    val createdAt: Instant
+
+    val persons: List<Person>?
+    val locations: List<Location>?
+
+    val numberOfPersons: Int?
+        get() = persons?.size
+
+    val numberOfLocations: Int?
+        get() = locations?.size
+}

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/ContactDiaryEntry.kt

@@ -3,7 +3,7 @@ package de.rki.coronawarnapp.contactdiary.model
 import java.time.Instant
 
 data class ContactDiaryEntry(
-    val person: Person,
-    val location: Location,
+    val person: List<Person>?,
+    val location: List<Location>?,
     val dateAddedEntry: Instant?
 )

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/Location.kt

 package de.rki.coronawarnapp.contactdiary.model
 
 data class Location(
-    val locationName:String
+    val locationName: String
 )

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/model/Person.kt

 package de.rki.coronawarnapp.contactdiary.model
 
 data class Person(
-    val completeName:String
+    val completeName: String
 )