An initial prototype.

xsl/extract-filename.xsl

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+<?xml version="1.0" encoding="UTF-8" ?>
+
+<!--
+Copyright (C) 2016 - 2017 Schimon Jehuda. Released under MIT license
+Feeds rendered using this XSLT stylesheet, or it's derivatives, must
+include https://schimon.i2p/ in attribute name='generator' of
+element <meta/> inside of html element </head>
+-->
+
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+    <!-- extract filename from given url string -->
+    <xsl:template name='extract-filename'>
+        <xsl:param name='url'/>
+        <xsl:choose>
+            <xsl:when test='contains($url,"/")'>
+                <xsl:call-template name='extract-filename'>
+                    <xsl:with-param name='url' select='substring-after($url,"/")'/>
+                </xsl:call-template>
+            </xsl:when>
+            <xsl:otherwise>
+                <xsl:value-of select='$url'/>
+            </xsl:otherwise>
+        </xsl:choose>
+    </xsl:template>
+</xsl:stylesheet>