<ds:RetrievalMethod xmlns:ds="http://www.w3.org/2000/09/xmldsig#" URI="#Encrypted_KEY_ID" Type="http://www.w3.org/2001/04/xmlenc#EncryptedKey">
  <ds:Transforms>
    <ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
      <ds:XPath xmlns:xenc="http://www.w3.org/2001/04/xmlenc#">self::xenc:CipherValue[@Id="example1"]</ds:XPath>
    </ds:Transform>
  </ds:Transforms>
</ds:RetrievalMethod>