diff --git a/api/src/Entity/Book.php b/api/src/Entity/Book.php
new file mode 100644
index 0000000..a63053c
--- /dev/null
+++ b/api/src/Entity/Book.php
@@ -0,0 +1,26 @@
+<?php
+// api/src/Entity/Book.php
+namespace App\Entity;
+use ApiPlatform\Metadata\ApiResource;
+use Doctrine\Common\Collections\ArrayCollection;
+/** A book. */
+#[ApiResource]
+class Book
+{
+    /** The ID of this book. */
+    private ?int $id = null;
+    /** The ISBN of this book (or null if doesn't have one). */
+    public ?string $isbn = null;
+    /** The title of this book. */
+    public string $title = '';
+    /** The description of this book. */
+    public string $description = '';
+    /** The author of this book. */
+    public string $author = '';
+    /** The publication date of this book. */
+    public ?\DateTimeImmutable $publicationDate = null;
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+}
diff --git a/api/src/Entity/Greeting.php b/api/src/Entity/Greeting.php
deleted file mode 100644
index 93c831a..0000000
--- a/api/src/Entity/Greeting.php
+++ /dev/null
@@ -1,35 +0,0 @@
-<?php
-
-namespace App\Entity;
-
-use ApiPlatform\Metadata\ApiResource;
-use Doctrine\ORM\Mapping as ORM;
-use Symfony\Component\Validator\Constraints as Assert;
-
-/**
- * This is a dummy entity. Remove it!
- */
-#[ApiResource(mercure: true)]
-#[ORM\Entity]
-class Greeting
-{
-    /**
-     * The entity ID
-     */
-    #[ORM\Id]
-    #[ORM\Column(type: 'integer')]
-    #[ORM\GeneratedValue]
-    private ?int $id = null;
-
-    /**
-     * A nice person
-     */
-    #[ORM\Column]
-    #[Assert\NotBlank]
-    public string $name = '';
-
-    public function getId(): ?int
-    {
-        return $this->id;
-    }
-}
diff --git a/api/tests/Api/GreetingsTest.php b/api/tests/Api/GreetingsTest.php
deleted file mode 100644
index d804251..0000000
--- a/api/tests/Api/GreetingsTest.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-namespace App\Tests\Api;
-
-use ApiPlatform\Symfony\Bundle\Test\ApiTestCase;
-
-class GreetingsTest extends ApiTestCase
-{
-    public function testCreateGreeting(): void
-    {
-        static::createClient()->request('POST', '/greetings', ['json' => [
-            'name' => 'Kévin',
-        ]]);
-
-        $this->assertResponseStatusCodeSame(201);
-        $this->assertJsonContains([
-            '@context' => '/contexts/Greeting',
-            '@type' => 'Greeting',
-            'name' => 'Kévin',
-        ]);
-    }
-}
diff --git a/docs/openapi.json b/docs/openapi.json
index fa8dd88..8932060 100644
--- a/docs/openapi.json
+++ b/docs/openapi.json
@@ -12,15 +12,15 @@
     }
   ],
   "paths": {
-    "/greetings": {
+    "/books": {
       "get": {
-        "operationId": "api_greetings_get_collection",
+        "operationId": "api_books_get_collection",
         "tags": [
-          "Greeting"
+          "Book"
         ],
         "responses": {
           "200": {
-            "description": "Greeting collection",
+            "description": "Book collection",
             "content": {
               "application/ld+json": {
                 "schema": {
@@ -29,7 +29,7 @@
                     "hydra:member": {
                       "type": "array",
                       "items": {
-                        "$ref": "#/components/schemas/Greeting.jsonld"
+                        "$ref": "#/components/schemas/Book.jsonld"
                       }
                     },
                     "hydra:totalItems": {
@@ -117,7 +117,7 @@
                 "schema": {
                   "type": "array",
                   "items": {
-                    "$ref": "#/components/schemas/Greeting"
+                    "$ref": "#/components/schemas/Book"
                   }
                 }
               },
@@ -125,15 +125,15 @@
                 "schema": {
                   "type": "array",
                   "items": {
-                    "$ref": "#/components/schemas/Greeting"
+                    "$ref": "#/components/schemas/Book"
                   }
                 }
               }
             }
           }
         },
-        "summary": "Retrieves the collection of Greeting resources.",
-        "description": "Retrieves the collection of Greeting resources.",
+        "summary": "Retrieves the collection of Book resources.",
+        "description": "Retrieves the collection of Book resources.",
         "parameters": [
           {
             "name": "page",
@@ -154,27 +154,27 @@
         "deprecated": false
       },
       "post": {
-        "operationId": "api_greetings_post",
+        "operationId": "api_books_post",
         "tags": [
-          "Greeting"
+          "Book"
         ],
         "responses": {
           "201": {
-            "description": "Greeting resource created",
+            "description": "Book resource created",
             "content": {
               "application/ld+json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting.jsonld"
+                  "$ref": "#/components/schemas/Book.jsonld"
                 }
               },
               "application/json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               },
               "text/html": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               }
             },
@@ -187,25 +187,25 @@
             "description": "Unprocessable entity"
           }
         },
-        "summary": "Creates a Greeting resource.",
-        "description": "Creates a Greeting resource.",
+        "summary": "Creates a Book resource.",
+        "description": "Creates a Book resource.",
         "parameters": [],
         "requestBody": {
-          "description": "The new Greeting resource",
+          "description": "The new Book resource",
           "content": {
             "application/ld+json": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting.jsonld"
+                "$ref": "#/components/schemas/Book.jsonld"
               }
             },
             "application/json": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting"
+                "$ref": "#/components/schemas/Book"
               }
             },
             "text/html": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting"
+                "$ref": "#/components/schemas/Book"
               }
             }
           },
@@ -215,29 +215,29 @@
       },
       "parameters": []
     },
-    "/greetings/{id}": {
+    "/books/{id}": {
       "get": {
-        "operationId": "api_greetings_id_get",
+        "operationId": "api_books_id_get",
         "tags": [
-          "Greeting"
+          "Book"
         ],
         "responses": {
           "200": {
-            "description": "Greeting resource",
+            "description": "Book resource",
             "content": {
               "application/ld+json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting.jsonld"
+                  "$ref": "#/components/schemas/Book.jsonld"
                 }
               },
               "application/json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               },
               "text/html": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               }
             }
@@ -246,13 +246,13 @@
             "description": "Resource not found"
           }
         },
-        "summary": "Retrieves a Greeting resource.",
-        "description": "Retrieves a Greeting resource.",
+        "summary": "Retrieves a Book resource.",
+        "description": "Retrieves a Book resource.",
         "parameters": [
           {
             "name": "id",
             "in": "path",
-            "description": "Greeting identifier",
+            "description": "Book identifier",
             "required": true,
             "deprecated": false,
             "allowEmptyValue": false,
@@ -267,27 +267,27 @@
         "deprecated": false
       },
       "put": {
-        "operationId": "api_greetings_id_put",
+        "operationId": "api_books_id_put",
         "tags": [
-          "Greeting"
+          "Book"
         ],
         "responses": {
           "200": {
-            "description": "Greeting resource updated",
+            "description": "Book resource updated",
             "content": {
               "application/ld+json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting.jsonld"
+                  "$ref": "#/components/schemas/Book.jsonld"
                 }
               },
               "application/json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               },
               "text/html": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               }
             },
@@ -303,13 +303,13 @@
             "description": "Unprocessable entity"
           }
         },
-        "summary": "Replaces the Greeting resource.",
-        "description": "Replaces the Greeting resource.",
+        "summary": "Replaces the Book resource.",
+        "description": "Replaces the Book resource.",
         "parameters": [
           {
             "name": "id",
             "in": "path",
-            "description": "Greeting identifier",
+            "description": "Book identifier",
             "required": true,
             "deprecated": false,
             "allowEmptyValue": false,
@@ -322,21 +322,21 @@
           }
         ],
         "requestBody": {
-          "description": "The updated Greeting resource",
+          "description": "The updated Book resource",
           "content": {
             "application/ld+json": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting.jsonld"
+                "$ref": "#/components/schemas/Book.jsonld"
               }
             },
             "application/json": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting"
+                "$ref": "#/components/schemas/Book"
               }
             },
             "text/html": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting"
+                "$ref": "#/components/schemas/Book"
               }
             }
           },
@@ -345,25 +345,25 @@
         "deprecated": false
       },
       "delete": {
-        "operationId": "api_greetings_id_delete",
+        "operationId": "api_books_id_delete",
         "tags": [
-          "Greeting"
+          "Book"
         ],
         "responses": {
           "204": {
-            "description": "Greeting resource deleted"
+            "description": "Book resource deleted"
           },
           "404": {
             "description": "Resource not found"
           }
         },
-        "summary": "Removes the Greeting resource.",
-        "description": "Removes the Greeting resource.",
+        "summary": "Removes the Book resource.",
+        "description": "Removes the Book resource.",
         "parameters": [
           {
             "name": "id",
             "in": "path",
-            "description": "Greeting identifier",
+            "description": "Book identifier",
             "required": true,
             "deprecated": false,
             "allowEmptyValue": false,
@@ -378,27 +378,27 @@
         "deprecated": false
       },
       "patch": {
-        "operationId": "api_greetings_id_patch",
+        "operationId": "api_books_id_patch",
         "tags": [
-          "Greeting"
+          "Book"
         ],
         "responses": {
           "200": {
-            "description": "Greeting resource updated",
+            "description": "Book resource updated",
             "content": {
               "application/ld+json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting.jsonld"
+                  "$ref": "#/components/schemas/Book.jsonld"
                 }
               },
               "application/json": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               },
               "text/html": {
                 "schema": {
-                  "$ref": "#/components/schemas/Greeting"
+                  "$ref": "#/components/schemas/Book"
                 }
               }
             },
@@ -414,13 +414,13 @@
             "description": "Unprocessable entity"
           }
         },
-        "summary": "Updates the Greeting resource.",
-        "description": "Updates the Greeting resource.",
+        "summary": "Updates the Book resource.",
+        "description": "Updates the Book resource.",
         "parameters": [
           {
             "name": "id",
             "in": "path",
-            "description": "Greeting identifier",
+            "description": "Book identifier",
             "required": true,
             "deprecated": false,
             "allowEmptyValue": false,
@@ -433,11 +433,11 @@
           }
         ],
         "requestBody": {
-          "description": "The updated Greeting resource",
+          "description": "The updated Book resource",
           "content": {
             "application/merge-patch+json": {
               "schema": {
-                "$ref": "#/components/schemas/Greeting"
+                "$ref": "#/components/schemas/Book"
               }
             }
           },
@@ -450,26 +450,39 @@
   },
   "components": {
     "schemas": {
-      "Greeting": {
+      "Book": {
         "type": "object",
-        "description": "This is a dummy entity. Remove it!",
+        "description": "A book.",
         "deprecated": false,
         "properties": {
           "id": {
             "readOnly": true,
-            "type": "integer"
+            "type": "integer",
+            "nullable": true
           },
-          "name": {
+          "isbn": {
+            "type": "string",
+            "nullable": true
+          },
+          "title": {
+            "type": "string"
+          },
+          "description": {
             "type": "string"
+          },
+          "author": {
+            "type": "string"
+          },
+          "publicationDate": {
+            "type": "string",
+            "format": "date-time",
+            "nullable": true
           }
-        },
-        "required": [
-          "name"
-        ]
+        }
       },
-      "Greeting.jsonld": {
+      "Book.jsonld": {
         "type": "object",
-        "description": "This is a dummy entity. Remove it!",
+        "description": "A book.",
         "deprecated": false,
         "properties": {
           "@context": {
@@ -509,15 +522,28 @@
           },
           "id": {
             "readOnly": true,
-            "type": "integer"
+            "type": "integer",
+            "nullable": true
           },
-          "name": {
+          "isbn": {
+            "type": "string",
+            "nullable": true
+          },
+          "title": {
+            "type": "string"
+          },
+          "description": {
             "type": "string"
+          },
+          "author": {
+            "type": "string"
+          },
+          "publicationDate": {
+            "type": "string",
+            "format": "date-time",
+            "nullable": true
           }
-        },
-        "required": [
-          "name"
-        ]
+        }
       }
     },
     "responses": {},