I have following XML

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE ONIXMessage SYSTEM "http://www.editeur.org/onix/2.1/reference/onix-international.dtd">
<ONIXMessage>
  <Header>
    <FromEANNumber>5013546111661</FromEANNumber>
    <FromCompany>NielsenBookData</FromCompany>
    <FromPerson>Angela Kendall</FromPerson>
    <FromEmail>[email protected]</FromEmail>
    <SentDate>20061213</SentDate>
    <DefaultLanguageOfText>eng</DefaultLanguageOfText>
  </Header>
  <Product>
    <RecordReference>9780643091610</RecordReference>
    <NotificationType>03</NotificationType>
    <RecordSourceType>04</RecordSourceType>
    <RecordSourceName>Nielsen BookData</RecordSourceName>
    <RecordSourceIdentifierType>02</RecordSourceIdentifierType>
    <RecordSourceIdentifier>NBD</RecordSourceIdentifier>
    <ProductIdentifier>
      <ProductIDType>15</ProductIDType>
      <IDValue>9780643091610</IDValue>
    </ProductIdentifier>
   </Product>
</ONIXMessage>

and have following XSL
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" xmlns:MyDateTime="urn:MyDateTime" exclude-result-prefixes="MyDateTime">

    <xsl:output method="xml" version="1.0" encoding="ISO-8859-1" omit-xml-declaration="no" indent="yes"/>
    <xsl:output doctype-system="http://www.editeur.org/onix/2.1/reference/onix-international.dtd"/>

    <xsl:template match="/">
        <xsl:comment>Transformed by ONIX Loader to make this valid XML file on <xsl:value-of select="MyDateTime:ToString()"/></xsl:comment>

        <ONIXMessage>
            <Header>
                <xsl:apply-templates select="ONIXMessage/Header/node()"/>
            </Header>

            <Product>
                <xsl:apply-templates select="ONIXMessage/Product/RecordReference"/>
                <xsl:apply-templates select="ONIXMessage/Product/NotificationType"/>
                <xsl:apply-templates select="ONIXMessage/Product/RecordSourceType"/>
                <xsl:apply-templates select="ONIXMessage/Product/RecordSourceIdentifierType"/>
                <xsl:apply-templates select="ONIXMessage/Product/RecordSourceIdentifier"/>
                <xsl:apply-templates select="ONIXMessage/Product/RecordSourceName"/>

                <xsl:apply-templates select="ONIXMessage/Product/node()"/>
            </Product>
        </ONIXMessage>
    </xsl:template>

    <xsl:template match="*">
        <xsl:copy>
            <xsl:copy-of select="node()"/>
        </xsl:copy>
    </xsl:template>

</xsl:stylesheet>

Output is
<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE ONIXMessage SYSTEM "http://www.editeur.org/onix/2.1/reference/onix-international.dtd">
<ONIXMessage>
  <Header>
    <FromEANNumber>5013546111661</FromEANNumber>
    <FromCompany>NielsenBookData</FromCompany>
    <FromPerson>Angela Kendall</FromPerson>
    <FromEmail>[email protected]</FromEmail>
    <SentDate>20061213</SentDate>
    <DefaultLanguageOfText>eng</DefaultLanguageOfText>
  </Header>
  <Product>
    <RecordReference>9780643091610</RecordReference>
    <NotificationType>03</NotificationType>
    <RecordSourceType>04</RecordSourceType>
    <RecordSourceIdentifierType>02</RecordSourceIdentifierType>
    <RecordSourceIdentifier>NBD</RecordSourceIdentifier>
    <RecordSourceName>Nielsen BookData</RecordSourceName>

    <RecordReference>9780643091610</RecordReference>
    <NotificationType>03</NotificationType>
    <RecordSourceType>04</RecordSourceType>
    <RecordSourceName>Nielsen BookData</RecordSourceName>
    <RecordSourceIdentifierType>02</RecordSourceIdentifierType>
    <RecordSourceIdentifier>NBD</RecordSourceIdentifier>

    <ProductIdentifier>
      <ProductIDType refname="ProductIDType" shortname="b221">15</ProductIDType>
      <IDValue refname="IDValue" shortname="b244">9780643091610</IDValue>
    </ProductIdentifier>
    <ProductForm>BB</ProductForm>
 </Product>
</ONIXMessage>

I just do not want tags coming in Red color (do not want to repeat again)

You only need to use apply-templates.. like this:


<Product>
    <xsl:apply-templates/>
</Product>

As a note, the reason you got all the items in red was becasue of this line:

    <xsl:apply-templates select="ONIXMessage/Product/node()"/>

just remove it