An XSL stylesheet that takes a SAML 2.0 metadata file and extracts the InCommon IdP entityIDs as plain text.

extract_InCommon_IdP_entityIDs.xsl

<?xml version="1.0" encoding="UTF-8"?>
<!--
	extract_InCommon_IdP_entityIDs.xsl
	
	XSL stylesheet that takes a SAML 2.0 metadata file and extracts the
	InCommon IdP entityIDs as plain text. The script recognizes an InCommon
	entity by the presence of the InCommon registrar ID "https://incommon.org".
-->
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
	xmlns:mdrpi="urn:oasis:names:tc:SAML:metadata:rpi"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	exclude-result-prefixes="xs md">

	<!-- Output is plain text -->
	<xsl:output method="text"/>

	<xsl:template match="//md:EntityDescriptor[md:IDPSSODescriptor][md:Extensions/mdrpi:RegistrationInfo[@registrationAuthority='https://incommon.org']]">
		<xsl:value-of select="@entityID"/>
		<xsl:text>&#x0a;</xsl:text>
	</xsl:template>
	
	<xsl:template match="text()">
		<!-- do nothing -->
	</xsl:template>
</xsl:stylesheet>