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Remove duplicate XML elements using XSLT

Today I faced an issue where I am receiving a XML message with duplicate elements. So I wanted to remove those duplicate elements using some condition . For that I came up with a XSLT which does that.

My XML input:

<OurGuestsCollection  xmlns="http://ws.wso2.org/dataservice">
   <OurGuests>
      <id>2</id>
      <firstname>Sample</firstname>
      <lastname>Sample</lastname>
      <email>One</email>
      <reg_date>2015-02-18T13:59:43.000+05:30</reg_date>
   </OurGuests>
   <OurGuests>
      <id>3</id>
      <firstname>Sample1</firstname>
      <lastname>Sample1</lastname>
      <email>One</email>
      <reg_date>2015-02-18T14:13:18.000+05:30</reg_date>
   </OurGuests>
   <OurGuests>
      <id>4</id>
      <firstname>Sample1</firstname>
      <lastname>Sample1</lastname>
      <email…