Twitter card meta data for blogger template

gistfile1.xml

<b:if cond='data:blog.pageType == &quot;item&quot;'>
	<meta content='@yourtwitterhandle' name='twitter:site'/>
    <meta content='yourdomainname.com' name='twitter:domain'/>
    <meta content='@yourtwitterhamdle' name='twitter:creator'/>
    <b:if cond='data:post.firstImageUrl'>
       <meta content='photo' name='twitter:card'/>
       <meta expr:content='data:post.firstImageUrl' name='twitter:image'/> 
    <b:else/>
       <meta content='summary' name='twitter:card'/>
       <b:if cond='data:blog.postImageThumbnailUrl'>
          <meta expr:content='data:blog.postImageThumbnailUrl' name='twitter:image'/> 
       </b:if>
    </b:if>
    <meta expr:content='data:blog.pageName' name='twitter:title'/>
    <meta expr:content='data:blog.metaDescription' name='twitter:description'/>    
</b:if>