diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39345ea..dea3e34 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Support catalogs
 - Use `osc:themes` instead of the themes extension
 
 ## [1.0.0-rc.1]
diff --git a/README.md b/README.md
index d626d2e..fb8429c 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 - **Title:** Open Science Catalog
 - **Identifier:** <https://stac-extensions.github.io/osc/v1.0.0-rc.2/schema.json>
 - **Field Name Prefix:** osc
-- **Scope:** Collection
+- **Scope:** Catalog, Collection, Item
 - **Extension [Maturity Classification](https://github.com/radiantearth/stac-spec/tree/master/extensions/README.md#extension-maturity):** Proposal
 - **Owner**: @constantinius
 
@@ -11,7 +11,7 @@ This document explains the Open Science Catalog Extension to the [SpatioTemporal
 (STAC) specification.
 
 - Examples:
-  - [Project Collection example](examples/4dionosphere-swarm-vip/collection.json): Shows a project STAC Collection
+  - [Project Catalog example](examples/4dionosphere-swarm-vip/catalog.json): Shows a project STAC Catalog
   - [Product Collection example](examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/collection.json): Shows a product STAC Collection
 - [JSON Schema](json-schema/schema.json)
 - [Changelog](./CHANGELOG.md)
@@ -52,7 +52,7 @@ A set of satellite missions which provided input for the product.
 ## Fields
 
 The fields in the table below can be used in these parts of STAC documents:
-- [ ] Catalogs
+- [x] Catalogs
 - [x] Collections
 - [x] Item Properties
 - [ ] Assets (for both Collections and Items, incl. Item Asset Definitions in Collections)
diff --git a/examples/4dionosphere-swarm-vip/collection.json b/examples/4dionosphere-swarm-vip/catalog.json
similarity index 81%
rename from examples/4dionosphere-swarm-vip/collection.json
rename to examples/4dionosphere-swarm-vip/catalog.json
index cc6c3d2..e60246a 100644
--- a/examples/4dionosphere-swarm-vip/collection.json
+++ b/examples/4dionosphere-swarm-vip/catalog.json
@@ -1,5 +1,5 @@
 {
-  "type": "Collection",
+  "type": "Catalog",
   "id": "4dionosphere-swarm-vip",
   "stac_version": "1.0.0",
   "description": "In the project Swarm satellite data and other datasets are used to determine determine the dominant scales in the ionosphere at different geomagnetic conditions and create a semi-empiric dynamic model of the ionosphere.",
@@ -55,27 +55,6 @@
     "theme:Magnetosphere_Ionosphere"
   ],
   "updated": "2023-03-15T16:24:03.357451Z",
-  "extent": {
-    "spatial": {
-      "bbox": [
-        [
-          -180,
-          -90,
-          18,
-          90
-        ]
-      ]
-    },
-    "temporal": {
-      "interval": [
-        [
-          "2020-04-07T00:00:00Z",
-          "2022-04-16T23:59:59Z"
-        ]
-      ]
-    }
-  },
-  "license": "proprietary",
   "links": [
     {
       "rel": "via",
@@ -92,11 +71,6 @@
       "href": "./model-ionosphere-4dionosphere/collection.json",
       "type": "application/json",
       "title": "Semi-empiric model of ionosphere processes_SWARM"
-    },
-    {
-      "rel": "parent",
-      "href": "../collection.json",
-      "type": "application/json"
     }
   ]
 }
\ No newline at end of file
diff --git a/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/collection.json b/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/collection.json
index bc4be76..514c1ac 100644
--- a/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/collection.json
+++ b/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/collection.json
@@ -54,9 +54,21 @@
     },
     {
       "rel": "parent",
-      "href": "../collection.json",
+      "href": "../catalog.json",
       "type": "application/json",
       "title": "SWARM VIP"
+    },
+    {
+      "rel": "root",
+      "href": "../catalog.json",
+      "type": "application/json",
+      "title": "SWARM VIP"
+    },
+    {
+      "rel": "item",
+      "href": "./item.json",
+      "type": "application/geo+json",
+      "title": "example"
     }
   ]
 }
\ No newline at end of file
diff --git a/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/item.json b/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/item.json
index f27eb12..fd1348a 100644
--- a/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/item.json
+++ b/examples/4dionosphere-swarm-vip/model-ionosphere-4dionosphere/item.json
@@ -1,6 +1,6 @@
 {
   "type": "Feature",
-  "id": "example-model",
+  "id": "example",
   "stac_version": "1.0.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/osc/v1.0.0-rc.2/schema.json"
@@ -26,12 +26,25 @@
     ],
     "datetime": "2023-03-15T16:24:03.357451Z"
   },
+  "collection": "model-ionosphere-4dionosphere",
   "links": [
     {
       "rel": "parent",
-      "href": "../collection.json",
+      "href": "./collection.json",
       "type": "application/json",
-      "title": "model-ionosphere-4dionosphere"
+      "title": "Semi-empiric model of ionosphere processes_SWARM"
+    },
+    {
+      "rel": "collection",
+      "href": "./collection.json",
+      "type": "application/json",
+      "title": "Semi-empiric model of ionosphere processes_SWARM"
+    },
+    {
+      "rel": "root",
+      "href": "../catalog.json",
+      "type": "application/json",
+      "title": "SWARM VIP"
     }
   ],
   "assets": {
diff --git a/json-schema/schema.json b/json-schema/schema.json
index 8e489c9..ab7401a 100644
--- a/json-schema/schema.json
+++ b/json-schema/schema.json
@@ -33,14 +33,17 @@
       }
     },
     {
-      "$comment": "This is the schema for STAC Collections.",
+      "$comment": "This is the schema for STAC Catalogs & Collections.",
       "type": "object",
       "required": [
         "type"
       ],
       "properties": {
         "type": {
-          "const": "Collection"
+          "enum": [
+            "Catalog",
+            "Collection"
+          ]
         }
       },
       "allOf": [