diff --git a/schema/schema.json b/schema/schema.json
new file mode 100644
index 0000000..877cd19
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+++ b/schema/schema.json
@@ -0,0 +1,433 @@
+{
+    "type": "array",
+    "items": {
+      "oneOf": [
+        {
+          "title": "istex.nb_doc",
+          "description": "Nombre de documents dans ISTEX",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["istex.nb_doc"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents"
+            }
+          },
+          "required": ["type", "date", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "istex.nb_doc_enriched",
+          "description": "Nombre de documents enrichis dans ISTEX",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["istex.nb_doc_enriched"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents enrichis"
+            }
+          },
+          "required": ["type", "date", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "istex.categories",
+          "description": "Nombre de documents pour une catégorie spécifique d'ISTEX",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": [
+                "istex.categories.scopus",
+                "istex.categories.wos",
+                "istex.categories.inist",
+                "istex.categories.scienceMetrix"
+              ],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "category": {
+              "type": "string",
+              "description": "Nom de la catégorie"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans la catégorie"
+            }
+          },
+          "required": ["type", "date", "category", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "istex.languages",
+          "description": "Nombre de documents pour une langue spécifique d'ISTEX",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["istex.languages"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "language": {
+              "type": "string",
+              "description": "Langue des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans la langue"
+            }
+          },
+          "required": ["type", "date", "language", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "istex.access_conditions",
+          "description": "Nombre de documents pour une condition d'accès spécifique d'ISTEX",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["istex.access_conditions"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "access_condition": {
+              "type": "string",
+              "description": "Condition d'accès des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans la condition d'accès"
+            }
+          },
+          "required": ["type", "date", "access_condition", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "istex.genres",
+          "description": "Nombre de documents pour un genre spécifique d'ISTEX",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["istex.genres"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "genre": {
+              "type": "string",
+              "description": "Genre des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans le genre"
+            }
+          },
+          "required": ["type", "date", "genre", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.nb_doc",
+          "description": "Nombre de documents pour un corpus spécifique",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.nb_doc"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans le corpus"
+            }
+          },
+          "required": ["type", "date", "corpus", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.enrichment",
+          "description": "Nombre de documents enrichis pour un corpus spécifique",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.enrichment"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            },
+            "enrichment": {
+              "type": "string",
+              "description": "Type d'enrichissement"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents enrichis"
+            }
+          },
+          "required": ["type", "date", "corpus", "enrichment", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.enrichment.lang",
+          "description": "Nombre de documents enrichis pour une langue spécifique d'un corpus",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.enrichment.lang"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            },
+            "enrichment": {
+              "type": "string",
+              "description": "Type d'enrichissement"
+            },
+            "language": {
+              "type": "string",
+              "description": "Langue des documents enrichis"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents enrichis dans la langue"
+            }
+          },
+          "required": ["type", "date", "corpus", "enrichment", "language", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.language",
+          "description": "Nombre de documents pour une langue spécifique d'un corpus",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.language"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            },
+            "language": {
+              "type": "string",
+              "description": "Langue des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans la langue"
+            }
+          },
+          "required": ["type", "date", "corpus", "language", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.access_condition",
+          "description": "Nombre de documents pour une condition d'accès spécifique d'un corpus",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.access_condition"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            },
+            "access_condition": {
+              "type": "string",
+              "description": "Condition d'accès des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans la condition d'accès"
+            }
+          },
+          "required": ["type", "date", "corpus", "access_condition", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.genre",
+          "description": "Nombre de documents pour un genre spécifique d'un corpus",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.genre"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            },
+            "genre": {
+              "type": "string",
+              "description": "Genre des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans le genre"
+            }
+          },
+          "required": ["type", "date", "corpus", "genre", "nb"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.category",
+          "description": "Nombre de documents pour une catégorie spécifique d'un corpus",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": [
+                "corpus.category.wos",
+                "corpus.category.scopus",
+                "corpus.category.inist",
+                "corpus.category.scienceMetrix"
+              ],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "cateogry": {
+              "type": "string",
+              "description": "Nom de la catégorie"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans la catégorie"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            }
+          },
+          "required": ["type", "date", "cateogry", "nb", "corpus"],
+          "additionalProperties": false
+        },
+        {
+          "title": "corpus.host.genre",
+          "description": "Nombre de documents pour un genre spécifique pour l'host d'un corpus",
+          "type": "object",
+          "properties": {
+            "type": {
+              "type": "string",
+              "enum": ["corpus.host.genre"],
+              "description": "Type de l'élément"
+            },
+            "date": {
+              "type": "string",
+              "format": "date",
+              "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
+              "description": "Date de la mesure au format yyyy-mm-dd"
+            },
+            "genre": {
+              "type": "string",
+              "description": "Genre des documents"
+            },
+            "nb": {
+              "type": "integer",
+              "description": "Nombre de documents dans le genre"
+            },
+            "corpus": {
+              "type": "string",
+              "description": "Nom du corpus"
+            }
+          },
+          "required": ["type", "date", "genre", "nb", "corpus"],
+          "additionalProperties": false
+        }
+      ]
+    }
+  }
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