xenc:Features*
    
      - 
        Element (and element content) encryption.
      
 
      - 
        Uses structures and features of XML Signature wherever possible.
      
 
      - 
        Uses XML Schema to describe content model.
      
 
      - 
        Can be used with XML Signature such that a recipient knows which encrypted
        blocks were encrypted before and after signature creation: she needs
        to leave those encrypted before signature generation untouched for the
        signature to validate.