Creating subjects via the XNAT REST API is simple. Performing a PUT to the following URI would create a subject. (This would create a subject called '1' within a project with the ID 'TEST') 

/data/archive/projects/TEST/subjects/1

The TEST project must exist before this command will succeed.


You can also assign demographics to this subject using the XML PATH shortcuts defined  here :   XNAT REST XML Path Shortcuts

To assign the gender and handedness to this subject, you would execute the following PUT.

/data/archive/projects/TEST/subjects/1?gender=male&handedness=left