diff --git a/api/middleware.yaml b/api/middleware.yaml
index 16df821..9cc36bd 100644
--- a/api/middleware.yaml
+++ b/api/middleware.yaml
@@ -69,22 +69,28 @@ paths:
           content:
             application/ld+json:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
             application/rdf+xml:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
             text/turtle:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
         "412":
           description: Invalid request parameters
       security:
@@ -99,22 +105,28 @@ paths:
         content:
           application/ld+json:
             schema:
-              type: array
               description: A model containing the Structured Data.
-              items:
-                type: object
+              oneOf:
+              - type: array
+                items:
+                  type: object
+              - type: string
           application/rdf+xml:
             schema:
-              type: array
               description: A model containing the Structured Data.
-              items:
-                type: object
+              oneOf:
+              - type: array
+                items:
+                  type: object
+              - type: string
           text/turtle:
             schema:
-              type: array
               description: A model containing the Structured Data.
-              items:
-                type: object
+              oneOf:
+              - type: array
+                items:
+                  type: object
+              - type: string
         required: true
       responses:
         "200":
@@ -150,22 +162,28 @@ paths:
           content:
             application/ld+json:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
             application/rdf+xml:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
             text/turtle:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
         "412":
           description: Invalid request parameters
       security:
@@ -239,22 +257,28 @@ paths:
           content:
             application/ld+json:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
             application/rdf+xml:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
             text/turtle:
               schema:
-                type: array
                 description: A model containing the Structured Data.
-                items:
-                  type: object
+                oneOf:
+                - type: array
+                  items:
+                    type: object
+                - type: string
         "412":
           description: Invalid request parameters
       security:
@@ -314,10 +338,12 @@ paths:
         content:
           application/ld+json:
             schema:
-              type: array
               description: A model containing the Structured Data.
-              items:
-                type: object
+              oneOf:
+              - type: array
+                items:
+                  type: object
+              - type: string
         required: true
       responses:
         "200":
@@ -437,10 +463,12 @@ components:
           type: string
           description: The entity URI.
         model:
-          type: array
           description: A model containing the Structured Data.
-          items:
-            type: object
+          oneOf:
+          - type: array
+            items:
+              type: object
+          - type: string
         private:
           type: boolean
           description: Whether the entity should be hidden from Linked Data and GraphQL.
@@ -467,10 +495,12 @@ components:
           description: "The property to apply the operation, JSONPath formatted (leading\
             \ slash) on, e.g. `/https://schema.org/image (note the leading slash)."
         value:
-          type: array
           description: A model containing the Structured Data.
-          items:
-            type: object
+          oneOf:
+          - type: array
+            items:
+              type: object
+          - type: string
     AutocompleteResult:
       type: object
       properties: