diff --git a/.vscode/bookdetails-schema.json b/.vscode/bookdetails-schema.json
new file mode 100644
index 0000000..db9251d
--- /dev/null
+++ b/.vscode/bookdetails-schema.json
@@ -0,0 +1,166 @@
+{
+  "$id": "bookdetails-schema.json#",
+  "default": {
+    "code": "ID3xx",
+    "title": "New book",
+    "desc": ["Nice", "A *new* book"],
+    "cover": {
+      "src": "",
+      "alt": ""
+    }
+  },
+
+  "properties": {
+    "code": {
+      "title": "Book code, follow the ID3xx pattern - Not used",
+      "type": "string",
+      "pattern": "^[A-Z0-9]{3}\\d{2}$"
+    },
+    "title": {
+      "type": "string",
+      "maxLength": 30
+    },
+    "author": {
+      "title": "Book authors",
+      "type": "array",
+      "maxLength": 5,
+      "items": {
+        "title": "Author",
+        "type": "string",
+        "examples": ["Neil Gailman", "Team Agate"]
+      },
+      "examples": [["Team Agate"], ["Neil Gailman", "Rachida Dati"]]
+    },
+    "desc": {
+      "title": "Book desc, markdown formated, each row is a paragraph.",
+      "type": "array"
+    },
+    "cover": {
+      "title": "Book cover",
+      "type": "object",
+      "required": ["src"],
+      "properties": {
+        "src": {
+          "title": "Source file path, in relative path",
+          "type": "string",
+          "format": "uri-reference",
+          "default": "",
+          "examples": ["img\\books\\ADV01_BC_FR.png"]
+        },
+        "alt": {
+          "type": "string",
+          "examples": ["ADV01_BC_FR"]
+        },
+        "title": {
+          "type": "string",
+          "examples": ["ADV01_BC_FR"]
+        }
+      },
+      "examples": [
+        {
+          "src": "img\\books\\ADV01_BC_FR.png",
+          "alt": "ADV01_BC_FR",
+          "title": "ADV01_BC_FR"
+        }
+      ]
+    },
+    "published-date": {
+      "title": "The published-date Schema",
+      "type": "string",
+      "default": "",
+      "examples": ["01/04/2018"]
+    },
+    "cf-date": {
+      "title": "The cf-date Schema",
+      "type": "string",
+      "format": "date",
+      "default": "",
+      "examples": ["14/03/2016"]
+    },
+    "physical-link": {
+      "title": "The physical-link Schema",
+      "type": "object",
+      "default": {},
+      "required": ["title", "href"],
+      "properties": {
+        "title": {
+          "title": "The title Schema",
+          "type": "string",
+          "default": "",
+          "examples": ["Acheter un exemplaire"]
+        },
+        "href": {
+          "title": "The href Schema",
+          "type": "string",
+          "format":"uri",
+          "default": "",
+          "examples": [
+            "https://www.philibertnet.com/fr/dragons/62090-dragons-1-aventuriers-livre-de-base-9782919256365.html"
+          ]
+        }
+      },
+      "examples": [
+        {
+          "title": "Acheter un exemplaire",
+          "href": "https://www.philibertnet.com/fr/dragons/62090-dragons-1-aventuriers-livre-de-base-9782919256365.html"
+        }
+      ]
+    },
+    "pdf-link": {
+      "title": "The pdf-link Schema",
+      "type": "object",
+      "default": {},
+      "required": ["title", "href"],
+      "properties": {
+        "title": {
+          "title": "The title Schema",
+          "type": "string",
+          "default": "",
+          "examples": ["Acheter le pdf"]
+        },
+        "href": {
+          "title": "The href Schema",
+          "type": "string",
+          "default": "",
+          "examples": [
+            "https://www.drivethrurpg.com/product/422886/Dragons--1--Livre-de-base--Aventuriers"
+          ]
+        }
+      },
+      "examples": [
+        {
+          "title": "Acheter le pdf",
+          "href": "https://www.drivethrurpg.com/product/422886/Dragons--1--Livre-de-base--Aventuriers"
+        }
+      ]
+    },
+    "cf-link": {
+      "title": "The cf-link Schema",
+      "type": "object",
+      "default": {},
+      "required": ["title", "href"],
+      "properties": {
+        "title": {
+          "title": "The title Schema",
+          "type": "string",
+          "default": "",
+          "examples": ["Ulule"]
+        },
+        "href": {
+          "title": "The href Schema",
+          "type": "string",
+          "default": "",
+          "examples": ["https://fr.ulule.com/dragons-5e/"]
+        }
+      },
+      "examples": [
+        {
+          "title": "Ulule",
+          "href": "https://fr.ulule.com/dragons-5e/"
+        }
+      ]
+    }
+  },
+  "additionalProperties": false,
+  "required": ["title", "desc", "cover"]
+}
diff --git a/.vscode/books-schemas.json b/.vscode/books-schemas.json
new file mode 100644
index 0000000..ee32a6b
--- /dev/null
+++ b/.vscode/books-schemas.json
@@ -0,0 +1,12 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "type": "object",
+    "patternProperties": {
+        "^[A-Z0-9]{3}\\d{2}$": {
+            "title": "Book code, follow the ID3xx pattern",
+            "type": "object",
+                "$ref": "bookdetails-schema.json#"
+        }
+    },
+    "additionalProperties": false
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
index b71d5fe..ed03022 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,11 +1,16 @@
 {
     "json.schemas": [
-        
         {
             "fileMatch": [
                 "data/spells/*.json"
             ],
             "url": "/./.vscode/spells-schemas.json"
+        },
+        {
+            "fileMatch": [
+                "data/books*.json"
+            ],
+            "url": "/./.vscode/books-schemas.json"
         }
     ],
     "stenography.apiKey": "caac2b35-1682-4741-a409-d687f69d9767",
diff --git a/lang/books-en.json b/data/books-en.json
similarity index 90%
rename from lang/books-en.json
rename to data/books-en.json
index d31f823..aae50f1 100644
--- a/lang/books-en.json
+++ b/data/books-en.json
@@ -12,7 +12,14 @@
       "title":"Acheter un exemplaire",
       "href":"https://www.philibertnet.com/fr/dragons/62090-dragons-1-aventuriers-livre-de-base-9782919256365.html"
     },
-    "pdf-link": "https://www.drivethrurpg.com/product/422886/Dragons--1--Livre-de-base--Aventuriers",
+    "pdf-link":{
+      "title":"Acheter le pdf",
+      "href":"https://www.drivethrurpg.com/product/422886/Dragons--1--Livre-de-base--Aventuriers"
+    },
+    "cf-link":{
+      "title":"Ulule",
+      "href":"https://fr.ulule.com/dragons-5e/"
+    },
     "author": ["Agate Team"],
     "published-date": "01/04/2018",
     "cf-date": "14/03/2016",
diff --git a/lang/books-fr.json b/data/books-fr.json
similarity index 93%
rename from lang/books-fr.json
rename to data/books-fr.json
index a7a2121..82fd7dc 100644
--- a/lang/books-fr.json
+++ b/data/books-fr.json
@@ -16,7 +16,7 @@
       "title":"Acheter le pdf",
       "href":"https://www.drivethrurpg.com/product/422886/Dragons--1--Livre-de-base--Aventuriers"
     },
-    "cf-link:":{
+    "cf-link":{
       "title":"Ulule",
       "href":"https://fr.ulule.com/dragons-5e/"
     },
@@ -32,7 +32,7 @@
   "CRE02": {
     "code": "CRE02",
     "title": "Créatures : Inframonde",
-    "desc": ["*"],
+    "desc": [],
     "physical-link": {
       "title":"Acheter un exemplaire",
       "href":""
@@ -41,7 +41,7 @@
       "title":"Acheter le pdf",
       "href":"https://www.drivethrurpg.com/product/422893/Dragons--5--Bestiaire--Creatures-2-Inframonde"
     },
-    "cf-link:":{
+    "cf-link":{
       "title":"Ulule",
       "href":"https://fr.ulule.com/dragons-creatures-de-l-inframonde/"
     },
@@ -53,5 +53,15 @@
       "alt": "CRE02_BC_FR",
       "title": "CRE02_BC_FR"
     } 
+  },"ADV02":{
+    "code": "ID3xx",
+    "title": "New book",
+    "desc": [
+      "Nice",
+      "A *new* book"
+    ],
+    "cover": ""
   }
+
+  
 }