diff --git a/build/v12_to_v13.xsl b/build/v12_to_v13.xsl
new file mode 100644
index 00000000..bbf94809
--- /dev/null
+++ b/build/v12_to_v13.xsl
@@ -0,0 +1,294 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+	v12_to_v13.xsl
+	
+	XSL stylesheet converting a Shibboleth 1.2 sites file into the equivalent for
+	Shibboleth 1.3, which is based on the SAML 1.1 profile of the SAML 2.0
+	metadata format.  No attempt is made to incorporate the separate trust
+	data used by Shibboleth 1.2.
+	
+	Author: Ian A. Young <ian@iay.org.uk>
+
+-->
+<xsl:stylesheet version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
+	xmlns:shib="urn:mace:shibboleth:1.0"
+	xmlns:shibmeta="urn:mace:shibboleth:metadata:1.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
+	exclude-result-prefixes="shib">
+
+	<!--Force UTF-8 encoding for the output.-->
+	<xsl:output omit-xml-declaration="no" method="xml" encoding="UTF-8" indent="yes"/>
+
+	<!--
+		SiteGroup is the root element for the sites file.  The corresponding element in the new format file
+		is an EntitiesDescriptor.
+	-->
+	<xsl:template match="shib:SiteGroup">
+		<EntitiesDescriptor Name="{@Name}">
+			<xsl:attribute name="xsi:schemaLocation">
+				<xsl:text>urn:oasis:names:tc:SAML:2.0:metadata sstc-saml-schema-metadata-2.0.xsd </xsl:text>
+				<xsl:text>urn:mace:shibboleth:metadata:1.0 shibboleth-metadata-1.0.xsd </xsl:text>
+				<xsl:text>http://www.w3.org/2000/09/xmldsig# xmldsig-core-schema.xsd</xsl:text>
+			</xsl:attribute>
+			<!--
+				Pass through text blocks and comments, and any shib elements.
+				These may be: OriginSite, DestinationSite or nested SiteGroup.
+			-->
+			<xsl:apply-templates select="text()|comment()|shib:*"/>
+		</EntitiesDescriptor>
+	</xsl:template>
+
+	<!--
+		Map OriginSite to an EntityDescriptor with a particular format.
+	-->
+	<xsl:template match="shib:OriginSite">
+		<EntityDescriptor entityID="{@Name}">
+			<!--
+				Copy through comments and text blocks at the start of the output element.
+				This means we don't lose comments, but there is no way to guarantee they will
+				come out "in the right place".
+			-->
+			<xsl:apply-templates select="text()|comment()"/>
+			<!--
+				Map HandleService and AttributeAuthority.  We need to pass in the (possibly empty)
+				set of Domain elements as a parameter.
+			-->
+			<xsl:apply-templates select="shib:HandleService|shib:AttributeAuthority">
+				<xsl:with-param name="Domain" select="shib:Domain"/>
+			</xsl:apply-templates>
+			<xsl:call-template name="Alias"/>
+			<xsl:apply-templates select="shib:Contact"/>
+		</EntityDescriptor>
+	</xsl:template>
+	
+	<!--
+		Map HandleService to IDPSSODescriptor.
+	-->
+	<xsl:template match="shib:HandleService">
+		<xsl:param name="Domain"/>
+		<IDPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:1.1:protocol urn:mace:shibboleth:1.0">
+			<!--
+				Extensions appears iff there is something to put in it.
+			-->
+			<xsl:if test="boolean($Domain)">
+				<Extensions>
+					<xsl:apply-templates select="$Domain"/>
+				</Extensions>
+			</xsl:if>
+			<KeyDescriptor use="signing">
+				<ds:KeyInfo>
+					<ds:KeyName>
+						<xsl:value-of select="@Name"/>
+					</ds:KeyName>
+				</ds:KeyInfo>
+			</KeyDescriptor>
+			<SingleSignOnService Binding="urn:mace:shibboleth:1.0:profiles:AuthnRequest"
+				Location="{@Location}"/>
+		</IDPSSODescriptor>
+	</xsl:template>
+
+	<!--
+		Map AttributeAuthority to AttributeAuthorityDescriptor.
+	-->
+	<xsl:template match="shib:AttributeAuthority">
+		<xsl:param name="Domain"/>
+		<AttributeAuthorityDescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:1.1:protocol">
+			<!--
+				Extensions appears iff there is something to put in it.
+			-->
+			<xsl:if test="boolean($Domain)">
+				<Extensions>
+					<xsl:apply-templates select="$Domain"/>
+				</Extensions>
+			</xsl:if>
+			<AttributeService Binding="urn:oasis:names:tc:SAML:1.0:bindings:SOAP-binding"
+				Location="{@Location}"/>
+		</AttributeAuthorityDescriptor>
+	</xsl:template>
+	
+	<!--
+		Map Domain to a Scope extension.
+	-->
+	<xsl:template match="shib:Domain">
+		<shibmeta:Scope>
+			<xsl:apply-templates select="@regexp"/>
+			<xsl:value-of select="."/>
+		</shibmeta:Scope>
+	</xsl:template>
+	
+	<!--
+		Map DestinationSite to an EntityDescriptor with a particular format.
+	-->
+	<xsl:template match="shib:DestinationSite">
+		<EntityDescriptor entityID="{@Name}">
+			<!--
+				Copy through comments and text blocks at the start of the output element.
+				This means we don't lose comments, but there is no way to guarantee they will
+				come out "in the right place".
+			-->
+			<xsl:apply-templates select="text()|comment()"/>
+			<!--
+				Generate IDPSSODescriptor.
+			-->
+			<SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:1.1:protocol">
+				<!--
+					Map @ErrorURL (if present) to @errorURL
+				-->
+				<xsl:apply-templates select="@ErrorURL"/>
+				<!--
+					Map AttributeRequester elements to KeyDescriptor elements.
+				-->
+				<xsl:apply-templates select="shib:AttributeRequester"/>
+				<!--
+					Map the AssertionConsumerServiceURL elements to
+					AssertionConsumerService elements.  The latter require unique
+					integer indices, so do this by looping over them and using
+					position in the loop to generate each index.
+				-->
+				<xsl:for-each select="shib:AssertionConsumerServiceURL">
+					<xsl:apply-templates select=".">
+						<xsl:with-param name="index" select="position()-1"/>
+					</xsl:apply-templates>
+				</xsl:for-each>
+			</SPSSODescriptor>
+			<xsl:call-template name="Alias"/>
+			<xsl:apply-templates select="shib:Contact"/>
+		</EntityDescriptor>
+	</xsl:template>
+
+	<!--
+		Map @ErrorURL to @errorURL
+	-->
+	<xsl:template match="@ErrorURL">
+		<xsl:attribute name="errorURL"><xsl:value-of select="."/></xsl:attribute>
+	</xsl:template>
+
+	<!--
+		Map AttributeRequester to KeyDescriptor.
+	-->
+	<xsl:template match="shib:AttributeRequester">
+		<KeyDescriptor>
+			<ds:KeyInfo>
+				<ds:KeyName>
+					<xsl:value-of select="@Name"/>
+				</ds:KeyName>
+			</ds:KeyInfo>
+		</KeyDescriptor>
+	</xsl:template>
+
+	<!--
+		Map AssertionConsumerServiceURL to AssertionConsumerService.
+	-->
+	<xsl:template match="shib:AssertionConsumerServiceURL">
+		<xsl:param name="index"/>
+		<AssertionConsumerService index="{$index}"
+			Binding="urn:oasis:names:tc:SAML:1.0:profiles:browser-post" Location="{@Location}"
+		/>
+	</xsl:template>
+
+	<!--
+		Named template to map a set of Alias elements to a corresponding Organization.
+	-->
+	<xsl:template name="Alias">
+		<xsl:if test="boolean(shib:Alias)">
+			<Organization>
+				<xsl:apply-templates select="shib:Alias" mode="OrganizationName"/>
+				<xsl:apply-templates select="shib:Alias" mode="OrganizationDisplayName"/>
+				<xsl:apply-templates select="shib:Alias" mode="OrganizationURL"/>
+			</Organization>
+		</xsl:if>
+	</xsl:template>
+
+	<!--
+		Map Alias to OrganizationName
+	-->
+	<xsl:template match="shib:Alias" mode="OrganizationName">
+		<OrganizationName>
+			<xsl:call-template name="copyXmlLang"/>
+			<xsl:value-of select="."/>
+		</OrganizationName>
+	</xsl:template>
+
+	<!--
+		Map Alias to OrganizationDisplayName
+	-->
+	<xsl:template match="shib:Alias" mode="OrganizationDisplayName">
+		<OrganizationDisplayName>
+			<xsl:call-template name="copyXmlLang"/>
+			<xsl:value-of select="."/>
+		</OrganizationDisplayName>
+	</xsl:template>
+
+	<!--
+		Map Alias to OrganizationURL
+	-->
+	<xsl:template match="shib:Alias" mode="OrganizationURL">
+		<OrganizationURL>
+			<xsl:call-template name="copyXmlLang"/>
+			<!-- there is nothing to map, but the URL is mandatory -->
+			<xsl:text>http://www.example.com/</xsl:text>
+		</OrganizationURL>
+	</xsl:template>
+
+	<!--
+		Copy an xml:lang attribute, or default to "en" if none present.
+	-->
+	<xsl:template name="copyXmlLang">
+		<xsl:if test="boolean(@xml:lang)">
+			<xsl:attribute name="xml:lang"><xsl:value-of select="@xml:lang"/></xsl:attribute>
+		</xsl:if>
+		<xsl:if test="not(boolean(@xml:lang))">
+			<xsl:attribute name="xml:lang">en</xsl:attribute>
+		</xsl:if>
+	</xsl:template>
+
+	<!--
+		Map Contact to ContactPerson
+	-->
+	<xsl:template match="shib:Contact">
+		<ContactPerson contactType="{@Type}">
+			<!--
+				There is no real mapping for the Name attribute, so we rather arbitrarily
+				dump that into GivenName rather than trying to split it into a GivenName and
+				a SurName or something complicated like that.
+			-->
+			<GivenName>
+				<xsl:value-of select="@Name"/>
+			</GivenName>
+			<!--
+				E-mail address, but only if it was present in the original.
+			-->
+			<xsl:apply-templates select="@Email" mode="Contact"/>
+		</ContactPerson>
+	</xsl:template>
+
+	<!--
+		E-mail address for Contact
+	-->
+	<xsl:template match="@Email" mode="Contact">
+		<EmailAddress>
+			<!-- add a "mailto:" to make an e-mail address into a valid URI. -->
+			<xsl:text>mailto:</xsl:text>
+			<xsl:value-of select="."/>
+		</EmailAddress>
+	</xsl:template>
+
+	<!--
+		By default, copy referenced attributes through unchanged.
+	-->
+	<xsl:template match="@*">
+		<xsl:attribute name="{name()}"><xsl:value-of select="."/></xsl:attribute>
+	</xsl:template>
+
+	<!--
+		By default, copy comments and text nodes through to the output unchanged.
+	-->
+	<xsl:template match="text()|comment()">
+		<xsl:copy/>
+	</xsl:template>
+
+</xsl:stylesheet>