diff --git a/src/films.tsp b/src/films.tsp
index 088098a..d5a8f03 100644
--- a/src/films.tsp
+++ b/src/films.tsp
@@ -28,7 +28,7 @@ model Film {
 	title: string;
 
 	/** The episode number of this film. */
-	episode_id: integer;
+	episode_id: int32;
 
 	/** The opening paragraphs at the beginning of this film. */
 	opening_crawl: string;
@@ -42,12 +42,27 @@ model Film {
 	/** The ISO 8601 date format of film release at original creator country. */
 	release_date: plainDate;
 
+	/** An array of species resource URLs that are in this film. */
+	species: url[];
+
+	/** An array of starship resource URLs that are in this film. */
+	starships: url[];
+
+	/** An array of vehicle resource URLs that are in this film. */
+	vehicles: url[];
+
+	/** An array of people resource URLs that are in this film. */
+	characters: url[];
+
+	/** An array of planet resource URLs that are in this film. */
+	planets: url[];
+
 	/** The hypermedia URL of this resource. */
-	url: string;
+	url: url;
 
 	/** The ISO 8601 date format of the time that this resource was created. */
-	created: string;
+	created: utcDateTime;
 
 	/** The ISO 8601 date format of the time that this resource was edited. */
-	edited: string;
+	edited: utcDateTime;
 }
diff --git a/src/people.tsp b/src/people.tsp
index 05fc079..d03da9b 100644
--- a/src/people.tsp
+++ b/src/people.tsp
@@ -49,14 +49,26 @@ model Person {
 	skin_color: string;
 
 	/** The URL of a planet resource, a planet that this person was born on or inhabits. */
-	homeworld: string;
+	homeworld: url;
+
+	/** An array of film resource URLs that this person has been in. */
+	films: url[];
+
+	/** An array of species resource URLs that this person belongs to. */
+	species: url[];
+
+	/** An array of starship resource URLs that this person has piloted. */
+	starships: url[];
+
+	/** An array of vehicle resource URLs that this person has piloted. */
+	vehicles: url[];
 
 	/** The hypermedia URL of this resource. */
-	url: string;
+	url: url;
 
 	/** The ISO 8601 date format of the time that this resource was created. */
-	created: string;
+	created: utcDateTime;
 
 	/** The ISO 8601 date format of the time that this resource was edited. */
-	edited: string;
+	edited: utcDateTime;
 }
diff --git a/src/planets.tsp b/src/planets.tsp
index 6665203..ad73de9 100644
--- a/src/planets.tsp
+++ b/src/planets.tsp
@@ -51,12 +51,18 @@ model Planet {
 	/** The percentage of the planet surface that is naturally occurring water or bodies of water. */
 	surface_water: string;
 
+	/** An array of People URL Resources that live on this planet. */
+	residents: url[];
+
+	/** An array of Film URL Resources that this planet has appeared in. */
+	films: url[];
+
 	/** The hypermedia URL of this resource. */
-	url: string;
+	url: url;
 
 	/** The ISO 8601 date format of the time that this resource was created. */
-	created: string;
+	created: utcDateTime;
 
 	/** The ISO 8601 date format of the time that this resource was edited. */
-	edited: string;
+	edited: utcDateTime;
 }
diff --git a/src/root.tsp b/src/root.tsp
index ea115f0..821725b 100644
--- a/src/root.tsp
+++ b/src/root.tsp
@@ -13,20 +13,20 @@ op root(): Root;
  */
 model Root {
 	/** The URL root for Film resources. */
-	films: string;
+	films: url;
 
 	/** The URL root for People resources. */
-	people: string;
+	people: url;
 
 	/** The URL root for Planet resources. */
-	planets: string;
+	planets: url;
 
 	/** The URL root for Species resources. */
-	species: string;
+	species: url;
 
 	/** The URL root for Starships resources. */
-	starships: string;
+	starships: url;
 
 	/** The URL root for Vehicles resources. */
-	vehicles: string;
+	vehicles: url;
 }
diff --git a/src/species.tsp b/src/species.tsp
index 5c4cb98..863bc55 100644
--- a/src/species.tsp
+++ b/src/species.tsp
@@ -51,12 +51,21 @@ model Species {
 	/** The language commonly spoken by this species. */
 	language: string;
 
+	/** The URL of a planet resource, a planet that this species originates from. */
+	homeworld: url;
+
+	/** An array of People URL Resources that are a part of this species. */
+	people: url[];
+
+	/** An array of Film URL Resources that this species has appeared in. */
+	films: url[];
+
 	/** The hypermedia URL of this resource. */
-	url: string;
+	url: url;
 
 	/** The ISO 8601 date format of the time that this resource was created. */
-	created: string;
+	created: utcDateTime;
 
 	/** The ISO 8601 date format of the time that this resource was edited. */
-	edited: string;
+	edited: utcDateTime;
 }
diff --git a/src/starships.tsp b/src/starships.tsp
index d12cfa1..bc2901e 100644
--- a/src/starships.tsp
+++ b/src/starships.tsp
@@ -63,12 +63,18 @@ model Starship {
 	/** The maximum length of time that this starship can provide consumables for its entire crew without having to resupply. */
 	consumables: string;
 
+	/** An array of Film URL Resources that this starship has appeared in. */
+	films: url[];
+
+	/** An array of People URL Resources that this starship has been piloted by. */
+	pilots: url[];
+
 	/** The hypermedia URL of this resource. */
-	url: string;
+	url: url;
 
 	/** The ISO 8601 date format of the time that this resource was created. */
-	created: string;
+	created: utcDateTime;
 
 	/** The ISO 8601 date format of the time that this resource was edited. */
-	edited: string;
+	edited: utcDateTime;
 }
diff --git a/src/vehicles.tsp b/src/vehicles.tsp
index 576a12e..a99f156 100644
--- a/src/vehicles.tsp
+++ b/src/vehicles.tsp
@@ -57,12 +57,18 @@ model Vehicle {
 	/** The maximum length of time that this vehicle can provide consumables for its entire crew without having to resupply. */
 	consumables: string;
 
+	/** An array of Film URL Resources that this vehicle has appeared in. */
+	films: url[];
+
+	/** An array of People URL Resources that this vehicle has been piloted by. */
+	pilots: url[];
+
 	/** The hypermedia URL of this resource. */
-	url: string;
+	url: url;
 
 	/** The ISO 8601 date format of the time that this resource was created. */
-	created: string;
+	created: utcDateTime;
 
 	/** The ISO 8601 date format of the time that this resource was edited. */
-	edited: string;
+	edited: utcDateTime;
 }