diff --git a/build/v13_to_v12_trust.xsl b/build/v13_to_v12_trust.xsl
new file mode 100644
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--- /dev/null
+++ b/build/v13_to_v12_trust.xsl
@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+	v13_to_v12_trust.xsl
+	
+	XSL stylesheet converting a SAML 2 metadata file describing a Shibboleth
+	1.3 federation into the equivalent Shibboleth 1.2 trust file.
+	
+	Author: Ian A. Young <ian@iay.org.uk>
+
+	$Id: v13_to_v12_trust.xsl,v 1.1 2005/04/05 12:44:52 iay Exp $
+-->
+<xsl:stylesheet version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
+	xmlns:shibmeta="urn:mace:shibboleth:metadata:1.0"
+	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns="urn:mace:shibboleth:trust:1.0"
+	exclude-result-prefixes="shibmeta md">
+
+	<!--
+		Version information for this file.  Remember to peel off the dollar signs
+		before dropping the text into another versioned file.
+	-->
+	<xsl:param name="cvsId">$Id: v13_to_v12_trust.xsl,v 1.1 2005/04/05 12:44:52 iay Exp $</xsl:param>
+
+	<!--
+		Add a comment to the start of the output file.
+	-->
+	<xsl:template match="/">
+		<xsl:comment>
+			<xsl:text>&#10;&#9;***DO NOT EDIT THIS FILE***&#10;&#10;</xsl:text>
+			<xsl:text>&#9;Converted by:&#10;&#10;&#9;</xsl:text>
+			<xsl:value-of select="substring-before(substring-after($cvsId, ': '), '$')"/>
+			<xsl:text>&#10;</xsl:text>
+		</xsl:comment>
+		<Trust>
+			<xsl:attribute name="xsi:schemaLocation">
+				<xsl:text>urn:mace:shibboleth:trust:1.0 shibboleth-trust-1.0.xsd </xsl:text>
+				<xsl:text>http://www.w3.org/2000/09/xmldsig# xmldsig-core-schema.xsd</xsl:text>
+			</xsl:attribute>
+			<xsl:apply-templates/>
+		</Trust>
+	</xsl:template>
+
+	<!--Force UTF-8 encoding for the output.-->
+	<xsl:output omit-xml-declaration="no" method="xml" encoding="UTF-8" indent="yes"/>
+
+	<!--
+		Extract a KeyAuthority extension from an EntitiesDescriptor or EntityDescriptor.
+	-->
+	<xsl:template match="md:EntitiesDescriptor | md:EntityDescriptor">
+		<xsl:if test="md:Extensions/shibmeta:KeyAuthority/ds:KeyInfo">
+			<KeyAuthority>
+				<!-- copy across VerifyDepth attribute if present -->
+				<xsl:apply-templates select="md:Extensions/shibmeta:KeyAuthority/@VerifyDepth"/>
+
+				<!-- generate KeyName -->
+				<ds:KeyName>
+					<xsl:value-of select="@Name"/>
+				</ds:KeyName>
+
+				<!-- copy across KeyInfo elements -->
+				<xsl:copy-of select="md:Extensions/shibmeta:KeyAuthority/ds:KeyInfo"/>
+			</KeyAuthority>
+		</xsl:if>
+
+		<!-- proceed to nested EntitiesDescriptor and EntityDescriptor elements -->
+		<xsl:apply-templates select="md:EntitiesDescriptor | md:EntityDescriptor"/>
+	</xsl:template>
+
+	<!--
+		By default, copy referenced attributes through unchanged.
+	-->
+	<xsl:template match="@*">
+		<xsl:attribute name="{name()}"><xsl:value-of select="."/></xsl:attribute>
+	</xsl:template>
+
+</xsl:stylesheet>