diff --git a/attic/extract_entityids.xsl b/attic/extract_entityids.xsl
new file mode 100644
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+++ b/attic/extract_entityids.xsl
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+	extract_entityids.xsl
+	
+	XSL stylesheet that takes a SAML 2.0 metadata file and extracts
+	a list of entity IDs.
+	
+	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:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:wayf="http://sdss.ac.uk/2006/06/WAYF"
+	exclude-result-prefixes="md ds wayf">
+
+	<!-- Output is plain text -->
+	<xsl:output method="text"/>
+
+	<xsl:template match="//md:EntityDescriptor">
+		<xsl:value-of select="@entityID"/>
+		<xsl:text>&#x0a;</xsl:text>
+	</xsl:template>
+	
+	<xsl:template match="text()">
+		<!-- do nothing -->
+	</xsl:template>
+</xsl:stylesheet>