diff --git a/index.html b/index.html
index 854fd8f6..54e4ca6c 100644
--- a/index.html
+++ b/index.html
@@ -74,6 +74,51 @@
   </div>
 
   <div class="d-none">
+    <div id="components">
+      <div data-type="string">
+        <div class="input-group-prepend">
+          <span class="input-group-text"></span>
+        </div>
+        <input type="text" class="form-control" onchange="updateField(this)" onfocus="this.select()">
+      </div>
+      <div data-type="enum">
+        <div class="input-group-prepend">
+          <span class="input-group-text"></span>
+        </div>
+        <select class="form-control entry-type" onchange="updateField(this)">
+        </select>
+      </div>
+      <div data-type="range">
+        <div class="input-group-prepend">
+          <span class="input-group-text"></span>
+          <button type="button" class="btn btn-outline-secondary bg-light dropdown-toggle dropdown-toggle-split" data-toggle="dropdown"></button>
+          <div class="dropdown-menu">
+            <a class="dropdown-item" value="exact" onclick="updateRangeType(this)" data-i18n="range.exact"></a>
+            <a class="dropdown-item" value="range" onclick="updateRangeType(this)" data-i18n="range.range"></a>
+            <a class="dropdown-item" value="binomial" onclick="updateRangeType(this)" data-i18n="range.binomial"></a>
+          </div>
+        </div>
+        <input type="text" class="form-control exact d-none rounded-right" value="1" onchange="updateField(this)" onfocus="this.select()">
+        <span class="input-group-text rounded-0 range d-none" data-i18n="range.min"></span>
+        <input type="text" class="form-control range min d-none" value="1" onchange="updateField(this)" onfocus="this.select()">
+        <span class="input-group-text rounded-0 range d-none" data-i18n="range.max"></span>
+        <input type="text" class="form-control range max d-none rounded-right" value="2" onchange="updateField(this)" onfocus="this.select()">
+        <span class="input-group-text rounded-0 binomial d-none" data-i18n="range.n"></span>
+        <input type="text" class="form-control binomial n d-none" value="1" onchange="updateField(this)" onfocus="this.select()">
+        <span class="input-group-text rounded-0 binomial d-none" data-i18n="range.p"></span>
+        <input type="text" class="form-control binomial p d-none rounded-right" value="0.5" onchange="updateField(this)" onfocus="this.select()">
+      </div>
+      <div data-type="radio">
+        <div class="input-group-prepend">
+          <span class="input-group-text"></span>
+        </div>
+        <div class="btn-group">
+          <button type="button" value="false" class="btn btn-secondary rounded-0" onclick="updateField(this)" data-i18n="false"></button>
+          <button type="button" value="true" class="btn btn-secondary" onclick="updateField(this)" data-i18n="true"></button>
+        </div>
+      </div>
+    </div>
+
     <div id="poolTemplate" class="card bg-success text-white mt-3 pool" data-field="pools[]">
       <div class="card-header pb-1">
         <button type="button" class="btn btn-danger mb-2 float-right" onclick="removeField(this)" data-i18n="remove_pool"></button>
@@ -1002,6 +1047,7 @@
   <script src="https://cdnjs.cloudflare.com/ajax/libs/i18next-xhr-backend/3.0.0/i18nextXHRBackend.min.js" integrity="sha384-dK+VwLEvPDbpKM7G7D/LtbW6W2zlt99nuVTwoYIkMulAedST9Vj9OCRkv2xV8GjD" crossorigin="anonymous"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-i18next/1.2.1/jquery-i18next.min.js" integrity="sha384-fLTSt6zHOb152KeFkj7kSiXdkyjKf6fjk5bdzWYLDPDo9evwd9PVs3TKoYYaaxdl" crossorigin="anonymous"></script>
   <script src="i18n.js" charset="utf-8"></script>
+  <script src="validate.js" charset="utf-8"></script>
   <script src="view.js" charset="utf-8"></script>
   <script src="model.js" charset="utf-8"></script>
 </body>
diff --git a/structure.json b/structure.json
new file mode 100644
index 00000000..dc43d9a5
--- /dev/null
+++ b/structure.json
@@ -0,0 +1,182 @@
+{
+  "root": {
+    "fields": [
+      {
+        "id": "type",
+        "type": "enum",
+        "values": [
+          "minecraft:empty",
+          "minecraft:entity",
+          "minecraft:block",
+          "minecraft:chest",
+          "minecraft:fishing",
+          "minecraft:generic"
+        ],
+        "default": "minecraft:generic"
+      },
+      {
+        "id": "pools",
+        "type": "array",
+        "values": "pool"
+      }
+    ]
+  },
+  "components": [
+    {
+      "id": "pool",
+      "type": "object",
+      "class": "card bg-success",
+      "default": {
+        "rolls": 1,
+        "entries": [
+          {
+            "type": "minecraft:item",
+            "name": "minecraft:stone"
+          }
+        ]
+      },
+      "fields": [
+        {
+          "id": "rolls",
+          "type": "range",
+          "default": 1
+        },
+        {
+          "id": "bonus_rolls",
+          "type": "number",
+          "default": 1
+        },
+        {
+          "id": "entries",
+          "type": "array",
+          "values": "entry"
+        },
+        {
+          "id": "conditions",
+          "type": "array",
+          "values": "condition"
+        }
+      ]
+    },
+    {
+      "id": "entry",
+      "type": "object",
+      "class": "card",
+      "default": {
+        "type": "minecraft:item",
+        "name": "minecraft:stone"
+      },
+      "fields": [
+        {
+          "id": "type",
+          "type": "enum",
+          "values": [
+            "minecraft:empty",
+            "minecraft:item",
+            "minecraft:tag",
+            "minecraft:loot_table",
+            "minecraft:alternatives",
+            "minecraft:sequence",
+            "minecraft:group",
+            "minecraft:dynamic"
+          ],
+          "default": "minecraft:item"
+        },
+        {
+          "id": "name",
+          "type": "string",
+          "default": "minecraft:stone",
+          "require": [
+            "minecraft:item",
+            "minecraft:tag",
+            "minecraft:loot_table",
+            "minecraft:dynamic"
+          ]
+        },
+        {
+          "id": "children",
+          "type": "array",
+          "values": "entry",
+          "require": [
+            "minecraft:alternatives",
+            "minecraft:sequence",
+            "minecraft:group"
+          ]
+        },
+        {
+          "id": "functions",
+          "type": "array",
+          "values": "function"
+        },
+        {
+          "id": "conditions",
+          "type": "array",
+          "values": "condition"
+        }
+      ]
+    },
+    {
+      "id": "function",
+      "type": "object",
+      "class": "card bg-info",
+      "default": {
+        "function": "minecraft:set_count",
+        "count": 2
+      },
+      "fields": [
+        {
+          "id": "function",
+          "type": "enum",
+          "values": [
+            "minecraft:set_count",
+            "minecraft:set_damage",
+            "minecraft:set_name",
+            "minecraft:set_lore",
+            "minecraft:set_nbt",
+            "minecraft:set_attributes",
+            "minecraft:set_contents",
+            "minecraft:enchant_randomly",
+            "minecraft:enchant_with_levels",
+            "minecraft:looting_enchant",
+            "minecraft:limit_count",
+            "minecraft:furnace_smelt",
+            "minecraft:explosion_decay",
+            "minecraft:fill_player_head",
+            "minecraft:copy_name",
+            "minecraft:copy_nbt",
+            "minecraft:apply_bonus"
+          ],
+          "default": "set_count"
+        },
+        {
+          "id": "count",
+          "type": "range",
+          "default": 2,
+          "require": [
+            "minecraft:set_count"
+          ]
+        },
+        {
+          "id": "damage",
+          "type": "range",
+          "default": 1,
+          "require": [
+            "minecraft:set_damage"
+          ]
+        }
+      ]
+    },
+    {
+      "id": "condition",
+      "type": "object",
+      "card": true,
+      "default": {
+        "condition": "minecraft:random_chance",
+        "chance": 0.5
+      },
+      "fields": [
+
+      ]
+    }
+  ]
+}
diff --git a/validate.js b/validate.js
index 7b1865a0..d2e0ce48 100644
--- a/validate.js
+++ b/validate.js
@@ -1,24 +1,24 @@
 
 function isString(data) {
-  return data && typeof data === 'string';
+  return data != undefined && typeof data === 'string';
 }
 
-function isNumber(var) {
-  return data && typeof data === 'number';
+function isNumber(data) {
+  return data != undefined && typeof data === 'number';
 }
 
-function isObject(var) {
-  return data && typeof data === 'object';
+function isObject(data) {
+  return data != undefined && typeof data === 'object' && !Array.isArray(data);
 }
 
-function isArray(var) {
-  return data && typeof data === 'object' && Array.isArray(data);
+function isArray(data) {
+  return data != undefined && typeof data === 'object' && Array.isArray(data);
 }
 
-function validateRange(data, default) {
+function validateRange(data) {
   if (data === undefined) return false;
   if (isObject(data)) {
-    if (isString(data.type) && var.type.endsWith('binomial'))
+    if (isString(data.type) && data.type.endsWith('binomial')) {
       if (isNumber(data.n) && isNumber(data.p)) {
         return {
           type: 'minecraft:binomial',
@@ -30,12 +30,11 @@ function validateRange(data, default) {
     let res = {};
     if (isNumber(data.min)) res.min = data.min;
     if (isNumber(data.max)) res.max = data.max;
-    }
   }
   return false;
 }
 
-function chooseOption(options, value, default) {
+function chooseOption(options, value, def) {
   for (option of options) {
     if (value === option) {
       return value;
@@ -43,23 +42,31 @@ function chooseOption(options, value, default) {
       return 'minecraft:' + value;
     }
   }
-  return default;
+  return def;
+}
+
+function namespace(list) {
+  let res = [];
+  for (let item of list) {
+    res.push('minecraft:' + item);
+  }
+  return res;
 }
 
 function validateTable(table) {
   let res = {};
   res.type = chooseOption(namespace(['empty', 'entity', 'block', 'chest', 'fishing', 'generic']), table.type, 'minecraft:generic');
+  res.pools = [];
   if (isArray(table.pools)) {
-    res.pools = [];
-    for (let entry of table.pools) {
-      res.pools.push(validatePool(pools));
+    for (let pool of table.pools) {
+      res.pools.push(validatePool(pool));
     }
   }
   return res;
 }
 
 function validatePool() {
-  let newpool = {};
-
+  let res = {};
+  res
   return res;
 }