Fix mbj4668#455

Author: Ladislav Lhotka

test/test_dsdl/ll-extensions.yin

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module name="ll-extensions"
+        xmlns="urn:ietf:params:xml:ns:yang:yin:1"
+        xmlns:test="http://example.com/ll/extensions">
+  <namespace uri="http://example.com/ll/extensions"/>
+  <prefix value="ext"/>
+  <extension name="metadata">
+    <description>
+      <text>Extension with YIN element argument.</text>
+    </description>
+    <argument name="data">
+      <yin-element value="true"/>
+    </argument>
+  </extension>
+  <extension name="author">
+    <description>
+      <text>Extension with YIN attribute argument.</text>
+    </description>
+    <argument name="name"/>
+  </extension>
+</module>

test/test_dsdl/ll-obu.yin

@@ -1,9 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module name="ll-obu"
         xmlns="urn:ietf:params:xml:ns:yang:yin:1"
-        xmlns:test="http://example.com/ll/obu">
+        xmlns:test="http://example.com/ll/obu"
+	xmlns:ext="http://example.com/ll/extensions">
   <namespace uri="http://example.com/ll/obu"/>
   <prefix value="obu"/>
+  <import module="ll-extensions">
+    <prefix value="ext"/>
+  </import>
   <container name="users">
     <list name="user">
       <key value="uid"/>
@@ -18,6 +22,10 @@
     </list>
   </container>
   <container name="admins">
+    <ext:metadata>
+      <ext:data>fake metadata</ext:data>
+      <ext:author name="ll"/>
+    </ext:metadata>
     <leaf-list name="admin">
       <ordered-by value="user"/>
       <type name="string"/>

xslt/gen-relaxng.xsl

@@ -373,6 +373,10 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     </xsl:choose>
   </xsl:template>
 
+  <xsl:template match="*">
+    <xsl:copy-of select="."/>
+  </xsl:template>
+
   <xsl:template match="rng:oneOrMore" mode="process">
     <xsl:choose>
       <xsl:when test="$target='edit-config'">