diff --git a/app/Library/Search/SolrDocumentXslt.php b/app/Library/Search/SolrDocumentXslt.php
index ce0be23..03691ae 100644
--- a/app/Library/Search/SolrDocumentXslt.php
+++ b/app/Library/Search/SolrDocumentXslt.php
@@ -21,15 +21,15 @@ class SolrDocumentXslt
 
             $this->processor = new \XSLTProcessor;
             $this->processor->importStyleSheet($xslt);
-        } catch (Exception $e) {
-            throw new Exception('invalid XSLT file for deriving Solr documents', 0, $e);
+        } catch (\Exception $e) {
+            throw new \Exception('invalid XSLT file for deriving Solr documents', 0, $e);
         }
     }
 
     public function toSolrDocument(Dataset $rdrDataset, \DOMDocument $solrDoc)
     {
         if (!($solrDoc instanceof \DOMDocument)) {
-            throw new Exception('provided Solr document must be instance of DOMDocument');
+            throw new \Exception('provided Solr document must be instance of DOMDocument');
         }
 
         $modelXml = $this->getModelXml($rdrDataset);//->saveXML();
diff --git a/composer.lock b/composer.lock
index d64d55f..29411ec 100755
--- a/composer.lock
+++ b/composer.lock
@@ -821,16 +821,16 @@
         },
         {
             "name": "laravel/framework",
-            "version": "v6.18.14",
+            "version": "v6.18.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laravel/framework.git",
-                "reference": "503d1511d6792b0b8d0a4bfed47f7c2f29634e1c"
+                "reference": "a1fa3ddc0bb5285cafa6844b443633f7627d75dc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/framework/zipball/503d1511d6792b0b8d0a4bfed47f7c2f29634e1c",
-                "reference": "503d1511d6792b0b8d0a4bfed47f7c2f29634e1c",
+                "url": "https://api.github.com/repos/laravel/framework/zipball/a1fa3ddc0bb5285cafa6844b443633f7627d75dc",
+                "reference": "a1fa3ddc0bb5285cafa6844b443633f7627d75dc",
                 "shasum": ""
             },
             "require": {
@@ -855,6 +855,7 @@
                 "symfony/finder": "^4.3.4",
                 "symfony/http-foundation": "^4.3.4",
                 "symfony/http-kernel": "^4.3.4",
+                "symfony/polyfill-php73": "^1.17",
                 "symfony/process": "^4.3.4",
                 "symfony/routing": "^4.3.4",
                 "symfony/var-dumper": "^4.3.4",
@@ -963,7 +964,7 @@
                 "framework",
                 "laravel"
             ],
-            "time": "2020-05-12T14:41:15+00:00"
+            "time": "2020-05-19T17:03:02+00:00"
         },
         {
             "name": "laravel/tinker",
@@ -1030,16 +1031,16 @@
         },
         {
             "name": "laravelcollective/html",
-            "version": "v6.1.1",
+            "version": "v6.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/LaravelCollective/html.git",
-                "reference": "895115187e6fca81350a0b1152b5804f52a8ac28"
+                "reference": "5ef9a3c9ae2423fe5618996f3cde375d461a3fc6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/LaravelCollective/html/zipball/895115187e6fca81350a0b1152b5804f52a8ac28",
-                "reference": "895115187e6fca81350a0b1152b5804f52a8ac28",
+                "url": "https://api.github.com/repos/LaravelCollective/html/zipball/5ef9a3c9ae2423fe5618996f3cde375d461a3fc6",
+                "reference": "5ef9a3c9ae2423fe5618996f3cde375d461a3fc6",
                 "shasum": ""
             },
             "require": {
@@ -1094,7 +1095,7 @@
             ],
             "description": "HTML and Form Builders for the Laravel Framework",
             "homepage": "https://laravelcollective.com",
-            "time": "2020-05-17T20:19:55+00:00"
+            "time": "2020-05-19T18:02:16+00:00"
         },
         {
             "name": "league/commonmark",
@@ -1431,16 +1432,16 @@
         },
         {
             "name": "nesbot/carbon",
-            "version": "2.34.0",
+            "version": "2.34.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/briannesbitt/Carbon.git",
-                "reference": "52ea68aebbad8a3b27b5d24e4c66ebe1933f8399"
+                "reference": "3e87404329b8072295ea11d548b47a1eefe5a162"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/briannesbitt/Carbon/zipball/52ea68aebbad8a3b27b5d24e4c66ebe1933f8399",
-                "reference": "52ea68aebbad8a3b27b5d24e4c66ebe1933f8399",
+                "url": "https://api.github.com/repos/briannesbitt/Carbon/zipball/3e87404329b8072295ea11d548b47a1eefe5a162",
+                "reference": "3e87404329b8072295ea11d548b47a1eefe5a162",
                 "shasum": ""
             },
             "require": {
@@ -1510,7 +1511,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-05-12T19:53:34+00:00"
+            "time": "2020-05-19T22:14:16+00:00"
         },
         {
             "name": "nikic/php-parser",
diff --git a/public/solr.xslt b/public/solr.xslt
index c5e1614..4285967 100644
--- a/public/solr.xslt
+++ b/public/solr.xslt
@@ -301,6 +301,14 @@
                     </xsl:element>
                 </xsl:for-each>
 
+                <!-- licences -->
+                <xsl:if test="/Opus/Rdr_Dataset/Licence">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">licence</xsl:attribute>
+                        <xsl:value-of select="@Name" />
+                    </xsl:element>
+                </xsl:for-each>
+
                 <!-- series ids and series number per id (modeled as dynamic field) -->
                 <xsl:for-each select="/Opus/Rdr_Dataset/Series">
                     <xsl:element name="field">
diff --git a/solr.xslt b/solr.xslt
index 262d4b0..afa7f9b 100644
--- a/solr.xslt
+++ b/solr.xslt
@@ -38,7 +38,8 @@
 
 <xsl:stylesheet version="1.0" 
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:php="http://php.net/xsl">
 
     <xsl:output method="xml" indent="yes" />
 
@@ -300,6 +301,14 @@
                     </xsl:element>
                 </xsl:for-each>
 
+                <!-- licences -->
+                <xsl:if test="/Opus/Rdr_Dataset/Licence">
+                    <xsl:element name="field">
+                        <xsl:attribute name="name">licence</xsl:attribute>
+                        <xsl:value-of select="@Name" />
+                    </xsl:element>
+                </xsl:for-each>
+
                 <!-- series ids and series number per id (modeled as dynamic field) -->
                 <xsl:for-each select="/Opus/Rdr_Dataset/Series">
                     <xsl:element name="field">
@@ -405,8 +414,7 @@
                 <xsl:for-each select="/Opus/Rdr_Dataset/Reference">
                     <xsl:element name="field">
                         <xsl:attribute name="name">reference</xsl:attribute>
-                         <xsl:value-of select="json-to-xml(/Opus/Rdr_Dataset/Reference)"/>
-                        <!-- <xsl:value-of select="@Value"/> -->
+                        <xsl:value-of select="@Value"/>
                     </xsl:element>
                 </xsl:for-each>