--- /dev/null
+<?xml version="1.0"?>
+
+<!-- Copyright (C) 2000, HELM Team -->
+<!-- -->
+<!-- This file is part of HELM, an Hypertextual, Electronic -->
+<!-- Library of Mathematics, developed at the Computer Science -->
+<!-- Department, University of Bologna, Italy. -->
+<!-- -->
+<!-- HELM is free software; you can redistribute it and/or -->
+<!-- modify it under the terms of the GNU General Public License -->
+<!-- as published by the Free Software Foundation; either version 2 -->
+<!-- of the License, or (at your option) any later version. -->
+<!-- -->
+<!-- HELM is distributed in the hope that it will be useful, -->
+<!-- but WITHOUT ANY WARRANTY; without even the implied warranty of -->
+<!-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -->
+<!-- GNU General Public License for more details. -->
+<!-- -->
+<!-- You should have received a copy of the GNU General Public License -->
+<!-- along with HELM; if not, write to the Free Software -->
+<!-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, -->
+<!-- MA 02111-1307, USA. -->
+<!-- -->
+<!-- For details, see the HELM World-Wide-Web page, -->
+<!-- http://cs.unibo.it/helm/. -->
+
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ xmlns:m="http://www.w3.org/1998/Math/MathML"
+ xmlns:helm="http://www.cs.unibo.it/helm"
+ xmlns:xlink="http://www.w3.org/1999/xlink">
+
+<!--***********************************************************************-->
+<!-- From MathML presentation or HTML to themselves with links -->
+<!-- HELM Group: Asperti, Padovani, Sacerdoti, Schena -->
+<!-- First draft: March 16 2001, Andrea Asperti -->
+<!--***********************************************************************-->
+
+<xsl:param name="action" select="''"/>
+<xsl:param name="expression" select="''"/>
+<xsl:param name="choices" select="''"/>
+<xsl:param name="interp" select="''"/>
+<xsl:param name="constraints" select="''"/>
+<xsl:param name="searchengineURL" select="''"/>
+
+<xsl:include href="links_library.xsl"/>
+
+<xsl:variable name="quoted_expression">
+ <xsl:call-template name="quote">
+ <xsl:with-param name="s" select="$expression"/>
+ </xsl:call-template>
+</xsl:variable>
+
+<xsl:variable name="quoted_choices">
+ <xsl:call-template name="quote">
+ <xsl:with-param name="s" select="$choices"/>
+ </xsl:call-template>
+</xsl:variable>
+
+<xsl:variable name="quoted_constraints">
+ <xsl:call-template name="quote">
+ <xsl:with-param name="s" select="$constraints"/>
+ </xsl:call-template>
+</xsl:variable>
+
+<xsl:variable name="param_constraints">
+ <xsl:choose>
+ <xsl:when test="$constraints=''">
+ <xsl:value-of select="''"/>
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:value-of select="concat('&constraints=',$quoted_constraints)"/>
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:variable>
+
+<xsl:template match="/">
+ <xsl:copy-of select="document(concat($searchengineURL,$action,'?expression=',$quoted_expression,'&choices=',$quoted_choices,'&interpretation_choices=',$interp,$param_constraints))"/>
+</xsl:template>
+
+</xsl:stylesheet>