To group N parts together

Name of header to tokenize instead of using the message body.

Sets the id of this node

The extraction mode. The available extraction modes are: i - injecting the
contextual namespace bindings into the extracted token (default) w - wrapping
the extracted token in its ancestor context u - unwrapping the extracted token
to its child content t - extracting the text content of the specified element

Whether to trim the value to remove leading and trailing whitespaces and line
breaks