I am trying to export data from and XMLType column & its getting truncated.
I tried csv, text, html, and insert formats. Large data gets truncated at around 4000 characters but its not exactly consistent.
Is this just not supported in SQL Developer, or am I missing something simple?
You are correct that there is currently a 4000 character limit when exporting large datatypes.
You can add your voice to SQL Developer feature requests using Feature Requests at the SQL Developer Exchange. This not only makes sure we don't forget, but also gives all users a chance to add their vote for features and provides a forum for you (the user base) to brainstorm on how you prefer it to work.
SQL Developer Team