diff --git a/Gemfile.lock b/Gemfile.lock
index 60f5bfa3..b09bbfd1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/ruby-rdf/json-ld.git
-  revision: c1e72171960b31bf417c7af9ecea6ebf75fd0316
+  revision: b1a47abbdd6db71d2b9ccb42811445fee1626d60
   branch: develop
   specs:
     json-ld (3.0.2)
@@ -74,7 +74,7 @@ GEM
       sparql (~> 3.0)
       sparql-client (~> 3.0)
     mini_portile2 (2.4.0)
-    multi_json (1.13.1)
+    multi_json (1.14.0)
     net-http-persistent (3.1.0)
       connection_pool (~> 2.2)
     nokogiri (1.10.4)
diff --git a/common/extract-examples.rb b/common/extract-examples.rb
index 23e1f841..d38156ac 100755
--- a/common/extract-examples.rb
+++ b/common/extract-examples.rb
@@ -18,6 +18,9 @@
 require 'yaml'
 require 'cgi'
 
+# Define I18N vocabulary
+class RDF::Vocab::I18N < RDF::Vocabulary("https://www.w3.org/ns/i18n#"); end unless RDF::Vocab.const_defined?(:I18N)
+
 # FIXME: This is here until the rdf:JSON is added in RDF.rb
 unless RDF::RDFV.properties.include?( RDF.to_uri + 'JSON')
   RDF::RDFV.property :JSON, label: "JSON", comment: "JSON datatype"
diff --git a/common/terms.html b/common/terms.html
index 1a122622..ff660e0e 100644
--- a/common/terms.html
+++ b/common/terms.html
@@ -113,8 +113,9 @@
     consists of a string and a non-empty language tag
     as defined by [[BCP47]].
     The <dfn data-cite="RDF11-CONCEPTS#dfn-language-tag">language tag</dfn> MUST be well-formed
-    according to <a data-cite="BCP47#section-2.2.9">section 2.2.9 Classes of Conformance</a> of [[BCP47]],
-    and is normalized to lowercase.</dd>
+    according to <a data-cite="BCP47#section-2.2.9">section 2.2.9 Classes of Conformance</a> of [[BCP47]].
+    <span class="changed note">Processors MAY normalize <a>language tags</a> to lowercase.</span>
+  </dd>
   <dt><dfn data-cite="LINKED-DATA" data-no-xref="" class="preserve">Linked Data</dfn></dt><dd>
     A set of documents, each containing a representation of a <a>linked data graph</a> or <a>dataset</a>.</dd>
   <dt><dfn data-cite="RDF11-CONCEPTS#dfn-rdf-graph" data-lt="linked data graph|graph" class="preserve">RDF graph</dfn></dt><dd>
diff --git a/index.html b/index.html
index 318f5016..8c45ce7f 100644
--- a/index.html
+++ b/index.html
@@ -5204,19 +5204,18 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
          data-result-for="Setting the default base direction of a JSON-LD document-compacted">
     <!--
     [{
-      "http://example.org/title": [{"@value": ****"HTML و CSS: تصميم و إنشاء مواقع الويب"****, "@language": "ar-eg", ****"@direction": "rtl"****}],
-      "http://example.org/publisher": [{"@value": ****"مكتبة"****, "@language": "ar-eg", ****"@direction": "rtl"****}]
+      "http://example.org/title": [{"@value": ****"HTML و CSS: تصميم و إنشاء مواقع الويب"****, "@language": "ar-EG", ****"@direction": "rtl"****}],
+      "http://example.org/publisher": [{"@value": ****"مكتبة"****, "@language": "ar-EG", ****"@direction": "rtl"****}]
     }]
     -->
     </pre>
     <table class="statements"
-           data-result-for="Setting the default base direction of a JSON-LD document-expanded"
            data-options="rdfDirection=i18n-datatype"
            data-to-rdf>
       <thead><tr><th>Subject</th><th>Property</th><th>Value</th><th>Language</th><th>Direction</th></tr></thead>
       <tbody>
-        <tr><td>_:b0</td><td>http://example.org/title</td><td lang="ar-eg" dir="rtl">HTML و CSS: تصميم و إنشاء مواقع الويب</td><td>ar-eg</td><td>rtl</td></tr>
-        <tr><td>_:b0</td><td>http://example.org/publisher</td><td lang="ar-eg" dir="rtl">مكتبة</td><td>ar-eg</td><td>rtl</td></tr>
+        <tr><td>_:b0</td><td>http://example.org/title</td><td lang="ar-EG" dir="rtl">HTML و CSS: تصميم و إنشاء مواقع الويب</td><td>ar-EG</td><td>rtl</td></tr>
+        <tr><td>_:b0</td><td>http://example.org/publisher</td><td lang="ar-EG" dir="rtl">مكتبة</td><td>ar-EG</td><td>rtl</td></tr>
       </tbody>
     </table>
     <pre class="turtle nohighlight"
@@ -5229,8 +5228,8 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
 
     # Note that this version drops the base direction.
     [
-      ex:title ****"HTML و CSS: تصميم و إنشاء مواقع الويب"****@ar-eg;
-      ex:publisher ****"مكتبة"****@ar-eg
+      ex:title ****"HTML و CSS: تصميم و إنشاء مواقع الويب"****@ar-EG;
+      ex:publisher ****"مكتبة"****@ar-EG
     ] .
     -->
     </pre>
@@ -5246,8 +5245,8 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
 
     # Note that this version preserves the base direction using a datatype.
     [
-      ex:title ****"HTML و CSS: تصميم و إنشاء مواقع الويب"^^i18n:ar-eg_rtl****;
-      ex:publisher ****"مكتبة"^^i18n:ar-eg_rtl****
+      ex:title ****"HTML و CSS: تصميم و إنشاء مواقع الويب"^^i18n:ar-EG_rtl****;
+      ex:publisher ****"مكتبة"^^i18n:ar-EG_rtl****
     ] .
     -->
     </pre>
@@ -5264,12 +5263,12 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
     [
       ex:title ****[
         rdf:value "HTML و CSS: تصميم و إنشاء مواقع الويب",
-        rdf:language "ar-eg",
+        rdf:language "ar-EG",
         rdf:direction "rtl"
       ]****;
       ex:publisher ****[
         rdf:value "مكتبة",
-        rdf:language "ar-eg",
+        rdf:language "ar-EG",
         rdf:direction "rtl"
       ]****
     ] .
@@ -5341,8 +5340,8 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
          data-to-rdf>
     <thead><tr><th>Subject</th><th>Property</th><th>Value</th><th>Language</th><th>Direction</th></tr></thead>
     <tbody>
-    <tr><td>_:b0</td><td>http://example.com/vocab/publisher</td><td lang="ar-eg">مكتبة</td><td>ar-eg</td><td></td></tr>
-    <tr><td>_:b0</td><td>http://example.com/vocab/title</td><td lang="ar-eg" dir="rtl">HTML و CSS: تصميم و إنشاء مواقع الويب</td><td>ar-eg</td><td><code>rtl</code></td></tr>
+    <tr><td>_:b0</td><td>http://example.com/vocab/publisher</td><td lang="ar-EG">مكتبة</td><td>ar-EG</td><td></td></tr>
+    <tr><td>_:b0</td><td>http://example.com/vocab/title</td><td lang="ar-EG" dir="rtl">HTML و CSS: تصميم و إنشاء مواقع الويب</td><td>ar-EG</td><td><code>rtl</code></td></tr>
     <tr><td>_:b0</td><td>http://example.com/vocab/title</td><td lang="en" dir="ltr">HTML and CSS: Design and Build Websites</td><td>en</td><td><code>ltr</code></td></tr>
     </tbody>
   </table>