<?xml version="1.0" encoding="UTF-8"?>
<employee>
   <INSTANCE>
      <book avtor="Иван Сид">Иван Сид</book>
      <title>Manager_1</title>
      </INSTANCE>
   <INSTANCE>
      <book avtor="Иван Гид">Иван Гид</book>
      <title>Man_2</title>
   </INSTANCE>
   <INSTANCE>
      <book avtor="Иван Петров">Иван Петров</book>
      <title>Manager_4</title>
   </INSTANCE>
</employee>

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0" xmlns:sch="http://www.ascc.net/xml/schematron">
  
  <xsl:template match="/">
    <xsl:text>  10 ;</xsl:text>
  	<root>
<xsl:text>& # 10 ;</xsl:text>
  	  <xsl:for-each select="//INSTANCE">
  	    <xsl:if test="contains(book/@avtor,'Гид')">
  	    <xsl:copy-of select="."/>
  	    </xsl:if>
  	    <xsl:text>& # 10 ;</xsl:text>  	  
  	  </xsl:for-each>
  	  <xsl:text>& # 10 ;</xsl:text>  	  
  	</root>	
</xsl:template>
</xsl:stylesheet>