new

 my $element = WSNotification::Elements::NotificationMessage->new($data);

Constructor. The following data structure may be passed to new():

 { # WSNotification::Types::NotificationMessageHolderType
   SubscriptionReference =>  { # WSNotification::Types::EndpointReferenceType
     Address =>  { value => $some_value },
     ReferenceParameters =>  { # WSNotification::Types::ReferenceParametersType
     },
     Metadata =>  { # WSNotification::Types::MetadataType
     },
   },
   Topic =>  { # WSNotification::Types::TopicExpressionType
   },
   ProducerReference =>  { # WSNotification::Types::EndpointReferenceType
     Address =>  { value => $some_value },
     ReferenceParameters =>  { # WSNotification::Types::ReferenceParametersType
     },
     Metadata =>  { # WSNotification::Types::MetadataType
     },
   },
   Message =>  {
   },
 },