If you need to use a more complex xpath query to say join several elements, you can use syntax similar to the below.  Please note #prefix is required to tell Sysero that this is a more complex xpath query.  The codepoints-to-string(10) is an example of adding a carriage return.

#concat(/postadresse/land/text(),codepoints-to-string(10),/postadresse/adresse/text())