diff --git a/2 - Metadata and Catalogue.ipynb b/2 - Metadata and Catalogue.ipynb
index 21eb213ece6cd7a1960a4d9898049fba0a6958ed..85ad7e097dd6a3ea36d2139262315595f54ce865 100644
--- a/2 - Metadata and Catalogue.ipynb	
+++ b/2 - Metadata and Catalogue.ipynb	
@@ -140,6 +140,67 @@
     "![simpledc xml schema](./media/simpledc.png)\n"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "* JSON\n",
+    "    * a string = { \"name\":\"John\" }\n",
+    "    * a number = { \"age\":30 }\n",
+    "    * an object (JSON object) = {\"employee\":{ \"name\":\"John\", \"age\":30, \"city\":\"New York\" }}\n",
+    "    * an array = {\"employees\":[ \"John\", \"Anna\", \"Peter\" ]}\n",
+    "    * a boolean = { \"sale\":true }\n",
+    "    * null = { \"middlename\":null }"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "* JSON-LD\n",
+    "    * JSON for Linked Data\n",
+    "    * keywords\n",
+    "        * @context to provide additional mappings from JSON to an RDF model (map terms to IRIs)\n",
+    "        * @id to uniquely identify things\n",
+    "        * @type to set the data type of a node or typed value\n",
+    "        * @container to set the default container type for a term\n",
+    "        * \"@container\": \"@set\" defines a container as an unordered set"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "```javascript\n",
+    "{\n",
+    "  \"@context\": {\n",
+    "    \"name\": \"http://xmlns.com/foaf/0.1/name\",\n",
+    "    \"homepage\": {\n",
+    "      \"@id\": \"http://xmlns.com/foaf/0.1/workplaceHomepage\",\n",
+    "      \"@type\": \"@id\"\n",
+    "    },\n",
+    "    \"Person\": \"http://xmlns.com/foaf/0.1/Person\"\n",
+    "  },\n",
+    "  \"@id\": \"https://me.example.com\",\n",
+    "  \"@type\": \"Person\",\n",
+    "  \"name\": \"John Smith\",\n",
+    "  \"homepage\": \"https://www.example.com/\"\n",
+    "}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {
@@ -165,6 +226,43 @@
     "* [https://open-na.hosted.exlibrisgroup.com/alma/contexts/bib](https://open-na.hosted.exlibrisgroup.com/alma/contexts/bib)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{'date': '9999',\n",
+       " 'note': 'Aus: (Sammelband von 63 Hochzeitsgedichten).',\n",
+       " 'identifier': [{'label': '(DE-599)OBVAC10480601'},\n",
+       "  {'label': '(Aleph)010690174ACC01'},\n",
+       "  {'label': '(AT-OBV)AC10480601'},\n",
+       "  {'label': 'AC10480601'}],\n",
+       " '@type': 'Book',\n",
+       " 'place_of_publication': 's.l.',\n",
+       " 'language': 'http://id.loc.gov/vocabulary/iso639-2/ger',\n",
+       " '@id': 'https://open-na.hosted.exlibrisgroup.com/alma/43ACC_NETWORK/bibs/990106901740203331',\n",
+       " 'title': 'Bey dem hochadelichen Helmrich- und Bassronischen Beylager, welches ... zu sonderbahren Ehren beyder Vermählten ...',\n",
+       " '@context': 'https://open-na.hosted.exlibrisgroup.com/alma/contexts/bib'}"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "import requests\n",
+    "cont=requests.get(\"https://open-na.hosted.exlibrisgroup.com/alma/43ACC_NETWORK/bibs/990106901740203331\")\n",
+    "cont.json()"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {
@@ -246,7 +344,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "metadata": {
     "slideshow": {
      "slide_type": "slide"