diff --git a/h5p.classes.php b/h5p.classes.php
index 40e0a83..35cfdf5 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -10,6 +10,38 @@ interface h5pFramework {
 
 class h5p {
   public $h5pF;
+  
+  // Schemas used to validate the h5p files
+  private $h5pRequired = array(
+    'title' => '^.{1,255}$',
+    'mainVersion' => '^[0-9]{1,5}$',
+    'language' => '^[a-z]{1,5}$',
+    'machineName' => '^[a-z0-9\-]{1,255}$',
+    'preloadedDependencies' => array(
+      'machineName' => '^[a-z0-9\-]{1,255}$',
+      'minimumVersion' => '^[0-9]{1,5}$',
+    ),
+    'init' => '^[$A-Z_][0-9A-Z_\.$]{1,254}$',
+    'embedTypes' => array('iframe', 'div'),
+  );
+  
+  private $h5pOptional = array(
+    'contentType' => '^.{1,255}$',
+    'utilization' => '^.{1,}$',
+    'subVersion' => '^[0-9]{1,5}$',
+    'author' => '^.{1,255}$',
+    'lisence' => '^(iframe|div)$',
+    'dynamicDependencies' => array(
+      'machineName' => '^[a-z0-9\-]{1,255}$',
+      'minimumVersion' => '^[0-9]{1,5}$',
+    ),
+    'preloadedJs' => '^(\\[a-z_\-\s0-9\.]+)+\.(?i)(js)$',
+    'preloadedCss' => '^(\\[a-z_\-\s0-9\.]+)+\.(?i)(js)$',
+    'w' => '^[0-9]{1,4}$',
+    'h' => '^[0-9]{1,4}$',
+    'metaKeywords' => '^.{1,}$',
+    'metaDescription' => '^.{1,}$',
+  );
 
   public function __construct($h5pFramework) {
     $this->h5pF = $h5pFramework;
@@ -78,7 +110,8 @@ class h5p {
           $this->rRmdir($file_path);
           continue;
         }
-
+        // We have decoded the json! Check for required properties
+        
       }
 
         if ($content->type != H5P_CONTENT && $content->type != H5P_LIBRARY) {