question: public static Element createElementInEncryptionSpace ( Document doc , String elementName ) { if ( doc == null ) { throw new RuntimeException ( "Document is null" ) ; } if ( ( xencPrefix == null ) || ( xencPrefix . length ( ) == 0 ) ) { return doc . createElementNS ( EncryptionConstants . EncryptionSpecNS , elementName ) ; } return doc . createElementNS ( EncryptionConstants . EncryptionSpecNS , xencPrefix + ":" + elementName ) ; }
target:  Creates an Element in the XML Encryption specification namespace.