Data Type Schema API
About
The Schemas API was introduced in XNAT 1.7 to provide information on installed data types, and to provide backwards compatibility for code developed against older versions of XNAT. There is a core set of namespaced endpoints that returns listings of datatypes, or can return the schemas themselves. In addition to these namespaced URIs, there are also direct "schema-only" paths that can return schemas, i.e. https://{server}/schemas/xdat.xsd.
XNAT 1.10.0 introduced the concept of “DB-backed” schemas, which are how Dynamic Data Types are stored. See: Adding a Dynamic Data Type
API Spec
(Open API documentation is only available to view online)