diff --git a/2 - Metadata and Catalogue.ipynb b/2 - Metadata and Catalogue.ipynb
index eb4bc497c7b4e2bb76c7565758e538eb07e0c629..551cf1b98803d2585e89dc1eeb03b1cf32fa817e 100644
--- a/2 - Metadata and Catalogue.ipynb	
+++ b/2 - Metadata and Catalogue.ipynb	
@@ -27,7 +27,8 @@
     "\n",
     "* Overview data formats\n",
     "* Overview container formats\n",
-    "* Overview protocols"
+    "* Overview protocols\n",
+    "* Overview SPARQL"
    ]
   },
   {
@@ -685,6 +686,1628 @@
     "    print('setSpec value for selective harvesting: ' + oai_set.setSpec)\n",
     "    print('Name of the set (setName): ' + oai_set.setName + '\\n')"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "source": [
+    "* SPARQL\n",
+    "    * Query language for the semantic web\n",
+    "    * since 2008 W3C recommendation\n",
+    "    * since 2013 SPARQL 1.1 W3C recommend"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "* 4 Types of SPARQL Queries\n",
+    "    * SELECT: select values and return them (we will only use that)\n",
+    "    * CONSTRUCT: create a new Graph\n",
+    "    * ASK: Boolean (True/False)\n",
+    "    * DESCRIBE: Describe a resource"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "source": [
+    "\n",
+    "   * Declear prefix shortcuts (optional)\n",
+    "       * PREFIX foo: <...>\n",
+    "   * Query result clause\n",
+    "       * SELECT ...\n",
+    "   * Define the dataset (optional)\n",
+    "      * FROM <...>\n",
+    "   * Query pattern\n",
+    "     *   WHERE {\n",
+    "        ...\n",
+    "        }\n",
+    "   * Query modifiers (optional):\n",
+    "    *    Group BY ...\n",
+    "     *   HAVING\n",
+    "     *   ORDER BY\n",
+    "     *   LIMIT\n",
+    "     *   OFFSET\n",
+    "     *  VALUES\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 73,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "from rdflib import Graph\n",
+    "import pandas as pd"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 39,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
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+       "        text-align: right;\n",
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+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
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+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#plac...</td>\n",
+       "      <td>http://d-nb.info/gnd/4065105-8</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Gete, J.V.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Gete, Jogann Vol'fgang fon</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>Ne3fc9cda376f4286b16ccc752d36d281</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>Wolfgang</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#rela...</td>\n",
+       "      <td>http://d-nb.info/gnd/1085154025</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Naa976c9bc0684e8bb126a4ba2bc97032</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Ǧūta, Yūhān Wulfǧānǧ fūn</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Nefb70c4291124fab989684f7a384fe38</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>N07b0d552440246b0abfbbdffa35fa03f</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>Nff66bf54af1149bc86bd2ba3df4ecfad</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#surname</td>\n",
+       "      <td>Giote</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Kote, Johann Volfgang</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Hëte, &amp;Euml;han Vol'fhanh</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Göte</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>גתה, יוהן וולפגנג פון</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Kote, J. V.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>15</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Göthe, J. W. von</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>16</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#oldA...</td>\n",
+       "      <td>(DE-588)1095607278</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>17</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#Diff...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>18</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goethe, I. W.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>19</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Giote, J. W.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>20</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>N26a14a384d164f70a548b001fc3a702f</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>21</th>\n",
+       "      <td>N4e955b2ab7404190b1b53d5a4e306909</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#surname</td>\n",
+       "      <td>Gete</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>22</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Gūta</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>23</th>\n",
+       "      <td>N25e814b61c554835a0deddd23e8cebd0</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>Iogann Vol'fgang</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>24</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Ndffad4623aed4bf5b3c934e7f83f02ea</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>25</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goe te</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>26</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goethe, Johann Wolfgang v.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>27</th>\n",
+       "      <td>Ne8ff4c14027a41e4ad880d08004fbea9</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#surname</td>\n",
+       "      <td>Ġūtih</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>28</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#prof...</td>\n",
+       "      <td>http://d-nb.info/gnd/4037215-7</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>29</th>\n",
+       "      <td>N191b4976c94c47a2b88ac931378afe1f</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>Jan Wolfang</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>677</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goethe, J. W. von</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>678</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>N8385bc99fabf41aabd0ca61d549977a6</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>679</th>\n",
+       "      <td>Nefb70c4291124fab989684f7a384fe38</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#surname</td>\n",
+       "      <td>Giote</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>680</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goethe, Johann W. von</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>681</th>\n",
+       "      <td>Nf369c1a73c3a489d9d6d915e7f4fe964</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#prefix</td>\n",
+       "      <td>v.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>682</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://www.w3.org/2002/07/owl#sameAs</td>\n",
+       "      <td>http://d-nb.info/gnd/185808069</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>683</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Gkaite, Giochan Bolphnkannk êphonë</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>684</th>\n",
+       "      <td>Ne8ff4c14027a41e4ad880d08004fbea9</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#prefix</td>\n",
+       "      <td>fūn</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>685</th>\n",
+       "      <td>N9dc4c209581642ceaf29a55e89fee755</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>V.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>686</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Ncd15232381e2403f9dc755e5c5c02787</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>687</th>\n",
+       "      <td>N814917d47f7443e0b8fc9dbe3ddd43b6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#pers...</td>\n",
+       "      <td>Ge de</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>688</th>\n",
+       "      <td>N5bbc43c691344ab595e59837a9163057</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>ヨハン・ヴォルフガング・フォン</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>689</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#acqu...</td>\n",
+       "      <td>http://d-nb.info/gnd/118727907</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>690</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goithios, I.V.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>691</th>\n",
+       "      <td>Na98f62af260142e28f528f192c6778ac</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#surname</td>\n",
+       "      <td>Goethe</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>692</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#biog...</td>\n",
+       "      <td>Staatsmann, Geheimrat</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>693</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>N42a4a757cafb4e1f9eb057bc2dad2cf8</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>694</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Гёте, Йоҳанн Волфганг</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>695</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goethe, Wolfgang von</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>696</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://www.w3.org/2002/07/owl#sameAs</td>\n",
+       "      <td>http://d-nb.info/gnd/1131918517</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>697</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Gyot'e, Yohan Wolfgang</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>698</th>\n",
+       "      <td>N3e2d670f9bee4c6cae886cf66cee1d65</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#pers...</td>\n",
+       "      <td>Gede</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>699</th>\n",
+       "      <td>Nb55ff0e4a0984fceb982221c923336c2</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>Giov. L.</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>700</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fami...</td>\n",
+       "      <td>http://d-nb.info/gnd/11687256X</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>701</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#prof...</td>\n",
+       "      <td>http://d-nb.info/gnd/4046517-2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>702</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://www.w3.org/2002/07/owl#sameAs</td>\n",
+       "      <td>http://d-nb.info/gnd/1095607278</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>703</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#oldA...</td>\n",
+       "      <td>(DE-588)185848826</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>704</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>N191b4976c94c47a2b88ac931378afe1f</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>705</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Ġūtah, Yūhān Fūlfġānḡ</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>706</th>\n",
+       "      <td>http://d-nb.info/gnd/118540238</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Goethe, J.W.</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>707 rows × 3 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
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+       "703     http://d-nb.info/gnd/118540238   \n",
+       "704     http://d-nb.info/gnd/118540238   \n",
+       "705     http://d-nb.info/gnd/118540238   \n",
+       "706     http://d-nb.info/gnd/118540238   \n",
+       "\n",
+       "                                                     1  \\\n",
+       "0    http://d-nb.info/standards/elementset/gnd#plac...   \n",
+       "1    http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "2    http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "3    http://d-nb.info/standards/elementset/gnd#fore...   \n",
+       "4    http://d-nb.info/standards/elementset/gnd#rela...   \n",
+       "5    http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "6    http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "7    http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "8    http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "9    http://d-nb.info/standards/elementset/gnd#surname   \n",
+       "10   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "11   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "12   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "13   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "14   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "15   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "16   http://d-nb.info/standards/elementset/gnd#oldA...   \n",
+       "17     http://www.w3.org/1999/02/22-rdf-syntax-ns#type   \n",
+       "18   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "19   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "20   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "21   http://d-nb.info/standards/elementset/gnd#surname   \n",
+       "22   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "23   http://d-nb.info/standards/elementset/gnd#fore...   \n",
+       "24   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "25   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "26   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "27   http://d-nb.info/standards/elementset/gnd#surname   \n",
+       "28   http://d-nb.info/standards/elementset/gnd#prof...   \n",
+       "29   http://d-nb.info/standards/elementset/gnd#fore...   \n",
+       "..                                                 ...   \n",
+       "677  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "678  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "679  http://d-nb.info/standards/elementset/gnd#surname   \n",
+       "680  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "681   http://d-nb.info/standards/elementset/gnd#prefix   \n",
+       "682               http://www.w3.org/2002/07/owl#sameAs   \n",
+       "683  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "684   http://d-nb.info/standards/elementset/gnd#prefix   \n",
+       "685  http://d-nb.info/standards/elementset/gnd#fore...   \n",
+       "686  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "687  http://d-nb.info/standards/elementset/gnd#pers...   \n",
+       "688  http://d-nb.info/standards/elementset/gnd#fore...   \n",
+       "689  http://d-nb.info/standards/elementset/gnd#acqu...   \n",
+       "690  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "691  http://d-nb.info/standards/elementset/gnd#surname   \n",
+       "692  http://d-nb.info/standards/elementset/gnd#biog...   \n",
+       "693  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "694  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "695  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "696               http://www.w3.org/2002/07/owl#sameAs   \n",
+       "697  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "698  http://d-nb.info/standards/elementset/gnd#pers...   \n",
+       "699  http://d-nb.info/standards/elementset/gnd#fore...   \n",
+       "700  http://d-nb.info/standards/elementset/gnd#fami...   \n",
+       "701  http://d-nb.info/standards/elementset/gnd#prof...   \n",
+       "702               http://www.w3.org/2002/07/owl#sameAs   \n",
+       "703  http://d-nb.info/standards/elementset/gnd#oldA...   \n",
+       "704  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "705  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "706  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "\n",
+       "                                                     2  \n",
+       "0                       http://d-nb.info/gnd/4065105-8  \n",
+       "1                                           Gete, J.V.  \n",
+       "2                           Gete, Jogann Vol'fgang fon  \n",
+       "3                                             Wolfgang  \n",
+       "4                      http://d-nb.info/gnd/1085154025  \n",
+       "5                    Naa976c9bc0684e8bb126a4ba2bc97032  \n",
+       "6                     Ǧūta, Yūhān Wulfǧānǧ fūn  \n",
+       "7                    Nefb70c4291124fab989684f7a384fe38  \n",
+       "8                    N07b0d552440246b0abfbbdffa35fa03f  \n",
+       "9                                                Giote  \n",
+       "10                               Kote, Johann Volfgang  \n",
+       "11                          Hëte, &Euml;han Vol'fhanh  \n",
+       "12                                               Göte  \n",
+       "13                               גתה, יוהן וולפגנג פון  \n",
+       "14                                         Kote, J. V.  \n",
+       "15                                   Göthe, J. W. von  \n",
+       "16                                  (DE-588)1095607278  \n",
+       "17   http://d-nb.info/standards/elementset/gnd#Diff...  \n",
+       "18                                       Goethe, I. W.  \n",
+       "19                                        Giote, J. W.  \n",
+       "20                   N26a14a384d164f70a548b001fc3a702f  \n",
+       "21                                                Gete  \n",
+       "22                                               Gūta  \n",
+       "23                                    Iogann Vol'fgang  \n",
+       "24                   Ndffad4623aed4bf5b3c934e7f83f02ea  \n",
+       "25                                              Goe te  \n",
+       "26                          Goethe, Johann Wolfgang v.  \n",
+       "27                                             Ġūtih  \n",
+       "28                      http://d-nb.info/gnd/4037215-7  \n",
+       "29                                         Jan Wolfang  \n",
+       "..                                                 ...  \n",
+       "677                                  Goethe, J. W. von  \n",
+       "678                  N8385bc99fabf41aabd0ca61d549977a6  \n",
+       "679                                              Giote  \n",
+       "680                              Goethe, Johann W. von  \n",
+       "681                                                 v.  \n",
+       "682                     http://d-nb.info/gnd/185808069  \n",
+       "683               Gkaite, Giochan Bolphnkannk êphonë  \n",
+       "684                                               fūn  \n",
+       "685                                                 V.  \n",
+       "686                  Ncd15232381e2403f9dc755e5c5c02787  \n",
+       "687                                              Ge de  \n",
+       "688                                 ヨハン・ヴォルフガング・フォン  \n",
+       "689                     http://d-nb.info/gnd/118727907  \n",
+       "690                                     Goithios, I.V.  \n",
+       "691                                             Goethe  \n",
+       "692                              Staatsmann, Geheimrat  \n",
+       "693                  N42a4a757cafb4e1f9eb057bc2dad2cf8  \n",
+       "694                            Гёте, Йоҳанн Волфганг  \n",
+       "695                               Goethe, Wolfgang von  \n",
+       "696                    http://d-nb.info/gnd/1131918517  \n",
+       "697                             Gyot'e, Yohan Wolfgang  \n",
+       "698                                               Gede  \n",
+       "699                                           Giov. L.  \n",
+       "700                     http://d-nb.info/gnd/11687256X  \n",
+       "701                     http://d-nb.info/gnd/4046517-2  \n",
+       "702                    http://d-nb.info/gnd/1095607278  \n",
+       "703                                  (DE-588)185848826  \n",
+       "704                  N191b4976c94c47a2b88ac931378afe1f  \n",
+       "705                      Ġūtah, Yūhān Fūlfġānḡ  \n",
+       "706                                       Goethe, J.W.  \n",
+       "\n",
+       "[707 rows x 3 columns]"
+      ]
+     },
+     "execution_count": 39,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#authority file Goethe: https://d-nb.info/gnd/118540238\n",
+    "goethe_rdf = \"https://d-nb.info/gnd/118540238/about/lds.rdf\"\n",
+    "#authority file Kreisky: https://d-nb.info/gnd/118566512\n",
+    "kreisky_rdf = \"https://d-nb.info/gnd/118566512/about/lds.rdf\"\n",
+    "#subject heading 'Medizin': https://d-nb.info/gnd/4038243-6\n",
+    "medicine_rdf = \"https://d-nb.info/gnd/4038243-6/about/lds.rdf\"\n",
+    "\n",
+    "#list all triples in authority file Goethe\n",
+    "g=Graph()\n",
+    "g.parse(goethe_rdf)\n",
+    "properties = g.query('''\n",
+    "   SELECT ?s ?p ?o \n",
+    "   WHERE {\n",
+    "      ?s ?p ?o .\n",
+    "   }\n",
+    "''')\n",
+    "df_goethe =  pd.DataFrame(properties)\n",
+    "df_goethe"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 43,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
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+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
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+       "\n",
+       "    .dataframe thead th {\n",
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+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
+       "      <th>1</th>\n",
+       "      <th>2</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://www.w3.org/2002/07/owl#sameAs</td>\n",
+       "      <td>http://www.wikidata.org/entity/Q11190</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>http://d-nb.info/gnd/040382435/about</td>\n",
+       "      <td>http://purl.org/dc/terms/license</td>\n",
+       "      <td>http://creativecommons.org/publicdomain/zero/1.0/</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Heilkunst</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://www.w3.org/2004/02/skos/core#exactMatch</td>\n",
+       "      <td>http://zbw.eu/stw/descriptor/15658-5</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gndS...</td>\n",
+       "      <td>http://d-nb.info/standards/vocab/gnd/gnd-sc#27.1a</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Medicine</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#Subj...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gndI...</td>\n",
+       "      <td>4038243-6</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#rela...</td>\n",
+       "      <td>http://dewey.info/class/610/</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://www.w3.org/2007/05/powder-s#describedby</td>\n",
+       "      <td>http://d-nb.info/gnd/040382435/about</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#oldA...</td>\n",
+       "      <td>(DE-588c)4038243-6</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "      <td>Humanmedizin</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>http://d-nb.info/gnd/040382435/about</td>\n",
+       "      <td>http://purl.org/dc/terms/modified</td>\n",
+       "      <td>2017-01-25T16:58:26</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>http://d-nb.info/gnd/4038243-6</td>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#pref...</td>\n",
+       "      <td>Medizin</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                                       0  \\\n",
+       "0         http://d-nb.info/gnd/4038243-6   \n",
+       "1   http://d-nb.info/gnd/040382435/about   \n",
+       "2         http://d-nb.info/gnd/4038243-6   \n",
+       "3         http://d-nb.info/gnd/4038243-6   \n",
+       "4         http://d-nb.info/gnd/4038243-6   \n",
+       "5         http://d-nb.info/gnd/4038243-6   \n",
+       "6         http://d-nb.info/gnd/4038243-6   \n",
+       "7         http://d-nb.info/gnd/4038243-6   \n",
+       "8         http://d-nb.info/gnd/4038243-6   \n",
+       "9         http://d-nb.info/gnd/4038243-6   \n",
+       "10        http://d-nb.info/gnd/4038243-6   \n",
+       "11        http://d-nb.info/gnd/4038243-6   \n",
+       "12  http://d-nb.info/gnd/040382435/about   \n",
+       "13        http://d-nb.info/gnd/4038243-6   \n",
+       "\n",
+       "                                                    1  \\\n",
+       "0                http://www.w3.org/2002/07/owl#sameAs   \n",
+       "1                    http://purl.org/dc/terms/license   \n",
+       "2   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "3      http://www.w3.org/2004/02/skos/core#exactMatch   \n",
+       "4   http://d-nb.info/standards/elementset/gnd#gndS...   \n",
+       "5   http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "6     http://www.w3.org/1999/02/22-rdf-syntax-ns#type   \n",
+       "7   http://d-nb.info/standards/elementset/gnd#gndI...   \n",
+       "8   http://d-nb.info/standards/elementset/gnd#rela...   \n",
+       "9      http://www.w3.org/2007/05/powder-s#describedby   \n",
+       "10  http://d-nb.info/standards/elementset/gnd#oldA...   \n",
+       "11  http://d-nb.info/standards/elementset/gnd#vari...   \n",
+       "12                  http://purl.org/dc/terms/modified   \n",
+       "13  http://d-nb.info/standards/elementset/gnd#pref...   \n",
+       "\n",
+       "                                                    2  \n",
+       "0               http://www.wikidata.org/entity/Q11190  \n",
+       "1   http://creativecommons.org/publicdomain/zero/1.0/  \n",
+       "2                                           Heilkunst  \n",
+       "3                http://zbw.eu/stw/descriptor/15658-5  \n",
+       "4   http://d-nb.info/standards/vocab/gnd/gnd-sc#27.1a  \n",
+       "5                                            Medicine  \n",
+       "6   http://d-nb.info/standards/elementset/gnd#Subj...  \n",
+       "7                                           4038243-6  \n",
+       "8                        http://dewey.info/class/610/  \n",
+       "9                http://d-nb.info/gnd/040382435/about  \n",
+       "10                                 (DE-588c)4038243-6  \n",
+       "11                                       Humanmedizin  \n",
+       "12                                2017-01-25T16:58:26  \n",
+       "13                                            Medizin  "
+      ]
+     },
+     "execution_count": 43,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#list all triples in subject heading 'Medizin'\n",
+    "g=Graph()\n",
+    "g.parse(medicine_rdf)\n",
+    "properties = g.query('''\n",
+    "   SELECT ?s ?p ?o \n",
+    "   WHERE {\n",
+    "      ?s ?p ?o .\n",
+    "   }\n",
+    "''')\n",
+    "df_medicine =  pd.DataFrame(properties)\n",
+    "df_medicine"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 71,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>http://purl.org/dc/terms/license</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gndI...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>http://www.w3.org/2004/02/skos/core#exactMatch</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>http://www.w3.org/2002/07/owl#sameAs</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>http://purl.org/dc/terms/modified</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#oldA...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#vari...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#pref...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>http://www.w3.org/2007/05/powder-s#describedby</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gndS...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#rela...</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                                                    0\n",
+       "0     http://www.w3.org/1999/02/22-rdf-syntax-ns#type\n",
+       "1                    http://purl.org/dc/terms/license\n",
+       "2   http://d-nb.info/standards/elementset/gnd#gndI...\n",
+       "3      http://www.w3.org/2004/02/skos/core#exactMatch\n",
+       "4                http://www.w3.org/2002/07/owl#sameAs\n",
+       "5                   http://purl.org/dc/terms/modified\n",
+       "6   http://d-nb.info/standards/elementset/gnd#oldA...\n",
+       "7   http://d-nb.info/standards/elementset/gnd#vari...\n",
+       "8   http://d-nb.info/standards/elementset/gnd#pref...\n",
+       "9      http://www.w3.org/2007/05/powder-s#describedby\n",
+       "10  http://d-nb.info/standards/elementset/gnd#gndS...\n",
+       "11  http://d-nb.info/standards/elementset/gnd#rela..."
+      ]
+     },
+     "execution_count": 71,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#list all distinct predicates in subject heading 'Medizin'\n",
+    "g=Graph()\n",
+    "g.parse(medicine_rdf)\n",
+    "properties = g.query('''\n",
+    "   SELECT DISTINCT ?p \n",
+    "   WHERE {\n",
+    "      ?s ?p ?o .\n",
+    "   }\n",
+    "''')\n",
+    "df_medicine =  pd.DataFrame(properties)\n",
+    "df_medicine"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 46,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>Medicine</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>Heilkunst</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>Humanmedizin</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "              0\n",
+       "0      Medicine\n",
+       "1     Heilkunst\n",
+       "2  Humanmedizin"
+      ]
+     },
+     "execution_count": 46,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#list all ariantNameForTheSubjectHeading 'Medizin'\n",
+    "g=Graph()\n",
+    "g.parse(medicine_rdf)\n",
+    "properties = g.query('''\n",
+    "   PREFIX gndo: <http://d-nb.info/standards/elementset/gnd#>\n",
+    "   SELECT ?o \n",
+    "   WHERE {\n",
+    "      ?s gndo:variantNameForTheSubjectHeading ?o .\n",
+    "      #?s gndo:preferredNameForTheSubjectHeading ?o .\n",
+    "   }\n",
+    "''')\n",
+    "df_medicine =  pd.DataFrame(properties)\n",
+    "df_medicine"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 52,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
+       "      <th>1</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>http://d-nb.info/gnd/4066009-6</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>Bundeskanzler 1970-1983</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>(DE-588a)118566512</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>Bruno</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>http://www.wikidata.org/entity/Q44517</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>http://dbpedia.org/resource/Bruno_Kreisky</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>Kreisky, Bruno</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>http://d-nb.info/gnd/121036073</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>http://d-nb.info/standards/vocab/gnd/gnd-sc#16.5p</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>https://de.wikipedia.org/wiki/Bruno_Kreisky</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>118566512</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>http://viaf.org/viaf/31998484</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>Politiker, Oesterreich</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#Diff...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>1990-07-29</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>15</th>\n",
+       "      <td>http://d-nb.info/standards/vocab/gnd/gender#male</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>16</th>\n",
+       "      <td>http://www.isni.org/0000000112608767</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>17</th>\n",
+       "      <td>http://id.loc.gov/authorities/n50043948</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>18</th>\n",
+       "      <td>http://d-nb.info/gnd/4046517-2</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>19</th>\n",
+       "      <td>2016-12-16T22:40:25</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>20</th>\n",
+       "      <td>http://www.filmportal.de/person/5B113A52F8F14A...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>21</th>\n",
+       "      <td>http://d-nb.info/gnd/118566512/about</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>22</th>\n",
+       "      <td>http://d-nb.info/gnd/2029382-3</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>23</th>\n",
+       "      <td>N6d057aa2f1874c6dbef28ea5e5545948</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>24</th>\n",
+       "      <td>1911-01-22</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>25</th>\n",
+       "      <td>Kreisky</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>26</th>\n",
+       "      <td>(DE-588c)4032993-8</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>27</th>\n",
+       "      <td>http://d-nb.info/standards/vocab/gnd/geographi...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>28</th>\n",
+       "      <td>http://creativecommons.org/publicdomain/zero/1.0/</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                                                    0  1\n",
+       "0                      http://d-nb.info/gnd/4066009-6  2\n",
+       "1                             Bundeskanzler 1970-1983  1\n",
+       "2                                  (DE-588a)118566512  1\n",
+       "3                                               Bruno  1\n",
+       "4               http://www.wikidata.org/entity/Q44517  1\n",
+       "5           http://dbpedia.org/resource/Bruno_Kreisky  1\n",
+       "6                                      Kreisky, Bruno  1\n",
+       "7                      http://d-nb.info/gnd/121036073  1\n",
+       "8   http://d-nb.info/standards/vocab/gnd/gnd-sc#16.5p  1\n",
+       "9         https://de.wikipedia.org/wiki/Bruno_Kreisky  1\n",
+       "10                                          118566512  1\n",
+       "11                      http://viaf.org/viaf/31998484  1\n",
+       "12                             Politiker, Oesterreich  1\n",
+       "13  http://d-nb.info/standards/elementset/gnd#Diff...  1\n",
+       "14                                         1990-07-29  1\n",
+       "15   http://d-nb.info/standards/vocab/gnd/gender#male  1\n",
+       "16               http://www.isni.org/0000000112608767  1\n",
+       "17            http://id.loc.gov/authorities/n50043948  1\n",
+       "18                     http://d-nb.info/gnd/4046517-2  1\n",
+       "19                                2016-12-16T22:40:25  1\n",
+       "20  http://www.filmportal.de/person/5B113A52F8F14A...  1\n",
+       "21               http://d-nb.info/gnd/118566512/about  1\n",
+       "22                     http://d-nb.info/gnd/2029382-3  1\n",
+       "23                  N6d057aa2f1874c6dbef28ea5e5545948  1\n",
+       "24                                         1911-01-22  1\n",
+       "25                                            Kreisky  1\n",
+       "26                                 (DE-588c)4032993-8  1\n",
+       "27  http://d-nb.info/standards/vocab/gnd/geographi...  1\n",
+       "28  http://creativecommons.org/publicdomain/zero/1.0/  1"
+      ]
+     },
+     "execution_count": 52,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#count all objects in authority file Kreisky\n",
+    "g=Graph()\n",
+    "g.parse(kreisky_rdf)\n",
+    "properties = g.query('''\n",
+    "   SELECT ?o (COUNT(*) AS ?cnt) {\n",
+    "      ?s ?p ?o .\n",
+    "   } GROUP BY ?o ORDER BY DESC(?cnt)\n",
+    "''')\n",
+    "df_kreisky =  pd.DataFrame(properties)\n",
+    "df_kreisky"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 74,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
+       "      <th>1</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>http://www.w3.org/2002/07/owl#sameAs</td>\n",
+       "      <td>6</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#oldA...</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#biog...</td>\n",
+       "      <td>2</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#pref...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gender</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>http://purl.org/dc/terms/license</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>6</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#prof...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>7</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fami...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>8</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#affi...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>9</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#plac...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>10</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gndI...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>11</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#surname</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>12</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#fore...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>13</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#date...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>14</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#date...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>15</th>\n",
+       "      <td>http://purl.org/dc/terms/modified</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>16</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#gndS...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>17</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#geog...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>18</th>\n",
+       "      <td>http://xmlns.com/foaf/0.1/page</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>19</th>\n",
+       "      <td>http://www.w3.org/2007/05/powder-s#describedby</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>20</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#pref...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>21</th>\n",
+       "      <td>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>22</th>\n",
+       "      <td>http://d-nb.info/standards/elementset/gnd#plac...</td>\n",
+       "      <td>1</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                                                    0  1\n",
+       "0                http://www.w3.org/2002/07/owl#sameAs  6\n",
+       "1   http://d-nb.info/standards/elementset/gnd#oldA...  2\n",
+       "2   http://d-nb.info/standards/elementset/gnd#biog...  2\n",
+       "3   http://d-nb.info/standards/elementset/gnd#pref...  1\n",
+       "4    http://d-nb.info/standards/elementset/gnd#gender  1\n",
+       "5                    http://purl.org/dc/terms/license  1\n",
+       "6   http://d-nb.info/standards/elementset/gnd#prof...  1\n",
+       "7   http://d-nb.info/standards/elementset/gnd#fami...  1\n",
+       "8   http://d-nb.info/standards/elementset/gnd#affi...  1\n",
+       "9   http://d-nb.info/standards/elementset/gnd#plac...  1\n",
+       "10  http://d-nb.info/standards/elementset/gnd#gndI...  1\n",
+       "11  http://d-nb.info/standards/elementset/gnd#surname  1\n",
+       "12  http://d-nb.info/standards/elementset/gnd#fore...  1\n",
+       "13  http://d-nb.info/standards/elementset/gnd#date...  1\n",
+       "14  http://d-nb.info/standards/elementset/gnd#date...  1\n",
+       "15                  http://purl.org/dc/terms/modified  1\n",
+       "16  http://d-nb.info/standards/elementset/gnd#gndS...  1\n",
+       "17  http://d-nb.info/standards/elementset/gnd#geog...  1\n",
+       "18                     http://xmlns.com/foaf/0.1/page  1\n",
+       "19     http://www.w3.org/2007/05/powder-s#describedby  1\n",
+       "20  http://d-nb.info/standards/elementset/gnd#pref...  1\n",
+       "21    http://www.w3.org/1999/02/22-rdf-syntax-ns#type  1\n",
+       "22  http://d-nb.info/standards/elementset/gnd#plac...  1"
+      ]
+     },
+     "execution_count": 74,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#count all predicates in authority file Kreisky\n",
+    "g=Graph()\n",
+    "g.parse(kreisky_rdf)\n",
+    "properties = g.query('''\n",
+    "   SELECT ?p(COUNT(*) AS ?cnt) {\n",
+    "      ?s ?p ?o .\n",
+    "   } GROUP BY ?p ORDER BY DESC(?cnt)\n",
+    "''')\n",
+    "df_kreisky =  pd.DataFrame(properties)\n",
+    "df_kreisky"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 72,
+   "metadata": {
+    "slideshow": {
+     "slide_type": "subslide"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>0</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>http://viaf.org/viaf/31998484</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>http://www.wikidata.org/entity/Q44517</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2</th>\n",
+       "      <td>http://id.loc.gov/authorities/n50043948</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>3</th>\n",
+       "      <td>http://www.filmportal.de/person/5B113A52F8F14A...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>4</th>\n",
+       "      <td>http://www.isni.org/0000000112608767</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>5</th>\n",
+       "      <td>http://dbpedia.org/resource/Bruno_Kreisky</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "                                                   0\n",
+       "0                      http://viaf.org/viaf/31998484\n",
+       "1              http://www.wikidata.org/entity/Q44517\n",
+       "2            http://id.loc.gov/authorities/n50043948\n",
+       "3  http://www.filmportal.de/person/5B113A52F8F14A...\n",
+       "4               http://www.isni.org/0000000112608767\n",
+       "5          http://dbpedia.org/resource/Bruno_Kreisky"
+      ]
+     },
+     "execution_count": 72,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#resource linked from \n",
+    "g=Graph()\n",
+    "g.parse('https://d-nb.info/gnd/118566512/about/lds.rdf')\n",
+    "properties = g.query('''\n",
+    "   PREFIX owl: <http://www.w3.org/2002/07/owl#>\n",
+    "   SELECT ?o \n",
+    "   WHERE {\n",
+    "      ?s owl:sameAs ?o .\n",
+    "   }\n",
+    "''')\n",
+    "df_kreisky =  pd.DataFrame(properties)\n",
+    "df_kreisky"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {