XML file name is XMLXSL.xml and the content is

<?xml version="1.0" encoding="utf-8" ?>
<?xml-stylesheet type="text/xsl" href="XSLTFile.xsl"?>
<HeaderTag>
yahoo|http://www.yahoo.com|google|http://www.google.com
</HeaderTag>

XSL file name is XSLTFile.xsl and content is:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:call-template name="output">
<xsl:with-param name="list" select="HeaderTag"></xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="output">
<xsl:param name="list" />
<xsl:variable name="newlist" select="concat(normalize-space($list), '|')" />
<xsl:variable name="first" select="substring-before($newlist, '|')" />
<xsl:variable name="remaining" select="substring-after($newlist, '|')" />
<xsl:variable name="second" select="substring-before($remaining, '|')" />
<xsl:variable name="remainingNext" select="substring-after($remaining, '|')" />
<id>
<xsl:variable name="URL" select="concat('<a href=',$second, '></a>')"/>
<xsl:if test="$remainingNext">
<a>
<xsl:attribute name="href">
<xsl:value-of select="$second"/>
</xsl:attribute>
<xsl:value-of select="$first" />
</a>
<br/>
</xsl:if>
<br/>
</id>
<xsl:if test="$remainingNext">
<xsl:call-template name="output">
<xsl:with-param name="list" select="$remainingNext" />
</xsl:call-template>
</xsl:if>
</xsl:template>
</xsl:stylesheet>