Embedding the multiple web content inside the web content

The below code is used for displaying 3 web contents inside the single web content.

 <div id="my-embedded-portlet">
  <runtime-portlet name="56" instance="1" queryString=""/>
 </div>
 <div id="my-embedded-portlet">
  <runtime-portlet name="56" instance="2" queryString=""/>
 </div>
 <div id="my-embedded-portlet">
  <runtime-portlet name="56" instance="3" queryString=""/>
 </div>


For multiple web content we have to give the instance values should be different name or parameters from one another.