diff --git a/oas-core/src/main/resources/SecurityDefinitionsSchema.json b/oas-core/src/main/resources/SecurityDefinitionsSchema.json
index 06eb2fb..dcb0888 100644
--- a/oas-core/src/main/resources/SecurityDefinitionsSchema.json
+++ b/oas-core/src/main/resources/SecurityDefinitionsSchema.json
@@ -1,78 +1,134 @@
 {
-    "$schema": "http://json-schema.org/draft-04/schema#",
-    "title": "Security definitions schema",
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "title": "Security definitions schema",
+  "type": "array",
+  "items": {
     "type": "object",
     "properties": {
-        "type": {
-            "type": "string"
-        },
-        "inherits-from": {
-            "type": "array",
-            "items": {
-                "type": "string"
-            }
+      "type": {
+        "type": "string"
+      },
+      "inherits-from": {
+        "type": "array",
+        "items": {
+          "type": "string"
         }
+      }
     },
-    "required": ["type"],
-    "additionalProperties": false,
-    "tests": [
+    "required": [
+      "type"
+    ],
+    "additionalProperties": false
+  },
+  "tests": [
+    {
+      "id": "VALID_1",
+      "description": "type and inherits-from",
+      "data": [
         {
-            "id": "VALID_1",
-            "description": "type and inherits-from",
-            "data": {
-                "type": "customType",
-                "inherits-from":  ["string1", "string2"]
-            },
-            "valid": true
-        },
-        {
-            "id": "VALID_2",
-            "description": "only type",
-            "data": {
-                "type": "customType"
-            },
-            "valid": true
-        },
-        {
-            "id": "VALID_3",
-            "description": "type and empty inherits-from",
-            "data": {
-                "type": "pii",
-                "inherits-from": []
-            },
-            "valid": true
-        },
-        {
-            "id": "INVALID_1",
-            "description": "type not of string type",
-            "data": {
-                "type": 1
-            },
-            "valid": false
-        },
-        {
-            "id": "INVALID_2",
-            "description": "inherits-from not of list type",
-            "data": {
-                "type": "customType1",
-                "inherits-from": "customType2"
-            },
-            "valid": false
-        },
-        {
-            "id": "INVALID_3",
-            "description": "Required field 'type' not given",
-            "data": {},
-            "valid": false
-        },
-        {
-            "id": "INVALID_4",
-            "description": "Additional field present",
-            "data": {
-                "type": "customType",
-                "customField": "customString"
-            },
-            "valid": false
+          "type": "customType",
+          "inherits-from": [
+            "string1",
+            "string2"
+          ]
         }
-    ]
+      ],
+      "valid": true
+    },
+    {
+      "id": "VALID_2",
+      "description": "only type",
+      "data": [
+        {
+          "type": "customType"
+        }
+      ],
+      "valid": true
+    },
+    {
+      "id": "VALID_3",
+      "description": "type and empty inherits-from",
+      "data": [
+        {
+          "type": "pii",
+          "inherits-from": []
+        }
+      ],
+      "valid": true
+    },
+    {
+      "id": "VALID_4",
+      "description": "array with multiple definitions",
+      "data": [
+        {
+          "type": "pii",
+          "inherits-from": [
+            "ns"
+          ]
+        },
+        {
+          "type": "spii",
+          "inherits-from": [
+            "pii"
+          ]
+        }
+      ],
+      "valid": true
+    },
+    {
+      "id": "VALID_5",
+      "description": "Empty array.",
+      "data": [],
+      "valid": true
+    },
+    {
+      "id": "INVALID_1",
+      "description": "type not of string type",
+      "data": {
+        "type": 1
+      },
+      "valid": false
+    },
+    {
+      "id": "INVALID_2",
+      "description": "inherits-from not of list type",
+      "data": [
+        {
+          "type": "customType1",
+          "inherits-from": "customType2"
+        }
+      ],
+      "valid": false
+    },
+    {
+      "id": "INVALID_3",
+      "description": "Required field 'type' not given",
+      "data": [
+        {}
+      ],
+      "valid": false
+    },
+    {
+      "id": "INVALID_4",
+      "description": "Additional field present",
+      "data": [
+        {
+          "type": "customType",
+          "customField": "customString"
+        }
+      ],
+      "valid": false
+    },
+    {
+      "id": "INVALID_5",
+      "description": "Object passed directly. Array expected.",
+      "data": {
+        "type": "pii",
+        "inherits-from": [
+          "ns"
+        ]
+      },
+      "valid": false
+    }
+  ]
 }
\ No newline at end of file