Transform xml to html adding or changing particular xml nodes and
corresponding attributes. The whole work must be done in the xsl itself.

1. The Html result:

<p>1</p>
<p>2</p>
<p code="cc" price="33">C</p>
<p>3</p>

2. The Html desired transformation result:

<p>1</p>
<p>2</p>
<p>33</p>

3. The xml:

<?xml version="1.0" encoding="UTF-8"?>
<Features>
  <Feature code="a" price = "1"></Feature>
  <Feature code="b" price = "2"></Feature>
  <Feature code="c" price = "3"></Feature>
</Features>

4. The xsl:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">

  <xsl:template match="@* | node()">
   <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
   </xsl:copy>
  </xsl:template>
  
  <xsl:template match="Feature[@code='c']">  
  <p code="cc" price="33">C</p>
   <xsl:apply-templates select="@*"/>
  </xsl:template>
 
  <xsl:template match="/">
    <xsl:apply-templates select="//Feature"/>
  </xsl:template>
  
  <xsl:template match="Feature">
   <xsl:apply-templates select="@price"/>
  </xsl:template>
 
  <xsl:template match="@price">
    <p><xsl:value-of select="."/> </p>
  </xsl:template>

</xsl:stylesheet>

I appreciate any instructions