Post to blogger from client app not show tag

Hi 
 I have a piece of code .This Php code create new post to blogger .But 
 content of post is different .
 Ex :  
  *# root content     *    

  $entry = "<entry xmlns='http://www.w3.org/2005/Atom'>
  <title type='text'> Before  </title>
   <content type='xhtml'>
  <iframe  width='100%' height='100%' src='http://www.mywebsite.com '*
></iframe>*
  </content>
   </entry>"; 

  *# posted content *( view blog post by hand )
   <iframe  width='100%' height='100%' src='http://www.mywebsite.com"* />*
*
*
  I edited <content type ="html" or xhtml .But this changed nothing . How 
to posted content same as root content .Thanks u so much ! 

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