diff --git a/schema/catalog-entry.schema.json b/schema/catalog-entry.schema.json
new file mode 100644
index 0000000..d41e88f
--- /dev/null
+++ b/schema/catalog-entry.schema.json
@@ -0,0 +1,67 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "https://drafts.opds.io/schema/catalog-entry.schema.json",
+  "title": "OPDS Catalog Entry",
+  "type": "object",
+  "properties": {
+    "metadata": {
+      "$ref": "https://readium.org/webpub-manifest/schema/metadata.schema.json"
+    },
+    "links": {
+      "type": "array",
+      "items": {
+        "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
+      },
+      "contains": {
+        "description": "A catalog entry must contain at least one catalog link.",
+        "type": "object",
+        "properties": {
+          "rel": {
+            "anyOf": [
+              {
+                "type": "string",
+                "enum": [
+                  "http://opds-spec.org/catalog"
+                ]
+              },
+              {
+                "type": "array",
+                "contains": {
+                  "type": "string",
+                  "enum": [
+                    "http://opds-spec.org/catalog"
+                  ]
+                }
+              }
+            ]
+          }
+        }
+      }
+    },
+    "image": {
+      "type": "object",
+      "title": "Image meant to be displayed to the user when browsing catalogs",
+      "allOf": [
+        {
+          "$ref": "https://readium.org/webpub-manifest/schema/link.schema.json"
+        },
+        {
+          "description": "The image resource must use one of the following formats: image/jpeg, image/png or image/gif.",
+          "properties": {
+            "type": {
+              "enum": [
+                "image/jpeg",
+                "image/png",
+                "image/gif"
+              ]
+            }
+          }
+        }
+      ]
+    }
+  },
+  "required": [
+    "metadata",
+    "links"
+  ]
+}
diff --git a/schema/feed.schema.json b/schema/feed.schema.json
index c0dcbfb..d5fccf1 100644
--- a/schema/feed.schema.json
+++ b/schema/feed.schema.json
@@ -16,6 +16,7 @@
       },
       "uniqueItems": true,
       "contains": {
+        "type": "object",
         "properties": {
           "rel": {
             "anyOf": [
@@ -37,6 +38,14 @@
         ]
       }
     },
+    "catalogs": {
+      "description": "A list of catalog-entry objects, to reference other OPDS feeds",
+      "type": "array",
+      "items": {
+        "$ref": "catalog-entry.schema.json"
+      },
+      "uniqueItems": true
+    },
     "publications": {
       "description": "A list of publications that can be acquired",
       "type": "array",
@@ -56,6 +65,7 @@
         {
           "description": "Each Link Object in a navigation collection must contain a title",
           "items": {
+            "type": "object",
             "required": [
               "title"
             ]
@@ -142,6 +152,11 @@
       "required": [
         "groups"
       ]
+    },
+    {
+      "required": [
+        "catalogs"
+      ]
     }
   ]
 }
diff --git a/schema/publication.schema.json b/schema/publication.schema.json
index 35aa57b..3cd59ae 100644
--- a/schema/publication.schema.json
+++ b/schema/publication.schema.json
@@ -14,6 +14,7 @@
       },
       "contains": {
         "description": "A publication must contain at least one acquisition link.",
+        "type": "object",
         "properties": {
           "rel": {
             "anyOf": [
@@ -60,6 +61,7 @@
         {
           "description": "At least one image resource must use one of the following formats: image/jpeg, image/png or image/gif.",
           "contains": {
+            "type": "object",
             "properties": {
               "type": {
                 "enum": [