diff --git a/test/test-xml.sh b/test/test-xml.sh
index 32333d7..d2b4b0f 100755
--- a/test/test-xml.sh
+++ b/test/test-xml.sh
@@ -47,8 +47,8 @@
 observed=$(xmlstarlet sel --net -t -v "count(/idsCorpus/idsDoc/idsText/idsHeader/fileDesc/publicationStmt/idno[@type='URN'])"  target/dnb18.i5.xml)
 assert_eq "$observed" "$min_expected" "exvery text has one idno element of type URN"
 
-observed=$(xmlstarlet sel --net -t -v "count(/idsCorpus/idsDoc/idsText/idsHeader/fileDesc/publicationStmt/idno[@type='URN' and @rend='URN'])"  target/dnb18.i5.xml)
-assert_eq "$observed" "$min_expected" "every idno element of type URN also has attribute rend='URN'"
+observed=$(xmlstarlet sel --net -t -v "count(/idsCorpus/idsDoc/idsText/idsHeader/fileDesc/publicationStmt/idno[@type='URL' and starts-with(@rend, 'URN;urn:nbn:de:')])"  target/dnb18.i5.xml)
+assert_eq "$observed" "$min_expected" "for every idno element of type URN, there is also an URL element with @rend starting with 'URN;urn:nbn:de:'"
 
 exit_with_test_summary
 
diff --git a/xslt/epub2i5.xsl b/xslt/epub2i5.xsl
index 734e644..d83e778 100644
--- a/xslt/epub2i5.xsl
+++ b/xslt/epub2i5.xsl
@@ -333,8 +333,8 @@
                                             <idno type="{$type}"><xsl:value-of select="replace(., '(([0-9]|-)+X?).*', '$1')"/></idno>
                                         </xsl:if>
                                     </xsl:when>
-                                    <xsl:when test="$type='URN'">
-                                        <idno rend="URN" type="URN"><xsl:value-of select="."/></idno>
+                                    <xsl:when test="$type='URL' and contains(., '/urn:nbn:de')">
+                                        <idno rend="URN;{tokenize(., '/')[last()]}" type="URL"><xsl:value-of select="."/></idno>
                                     </xsl:when>
                                     <xsl:otherwise><idno type="{$type}"><xsl:value-of select="."/></idno></xsl:otherwise>
                                 </xsl:choose>