Normalise xenc namespace without prefix in fallback aggregate

See ukf/ukf-meta#110.

mdx/uk/README.md

@@ -65,8 +65,7 @@ Status (2017-03-02):
 
 ### Fallback Aggregate vs. Production Aggregate
 
-Status (2017-03-10):
+Status (2017-03-14):
 
 * the production aggregate implements a _blacklisting_ approach to entity attributes imported from eduGAIN,
 while the production aggregate implements the traditional entity attribute _whitelist_. (2017-03-02)
-* The production aggregate normalises the `xenc` namespace to not use a prefix, as it is not very commonly used. (2017-02-13)

mdx/uk/ns_norm_back.xsl

@@ -38,8 +38,9 @@
 	xmlns:shibmd="urn:mace:shibboleth:metadata:1.0"
 	xmlns:ukfedlabel="http://ukfederation.org.uk/2006/11/label"
 	xmlns:wayf="http://sdss.ac.uk/2006/06/WAYF"
+	xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"
 
-	exclude-result-prefixes="alg md wayf"
+	exclude-result-prefixes="alg md wayf xenc"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 	xmlns="urn:oasis:names:tc:SAML:2.0:metadata">
@@ -113,5 +114,26 @@
 		</xsl:element>
 	</xsl:template>
 
+
+	<!--
+        ***************************************
+        ***                                 ***
+        ***   X E N C   N A M E S P A C E   ***
+        ***                                 ***
+        ***************************************
+    -->
+
+
+	<!--
+        xenc:*
+        
+        Normalise namespace to not use a prefix.
+    -->
+	<xsl:template match="xenc:*">
+		<xsl:element name="{local-name()}" namespace="http://www.w3.org/2001/04/xmlenc#">
+			<xsl:apply-templates select="node()|@*"/>
+		</xsl:element>
+	</xsl:template>	
+
 
 </xsl:stylesheet>