Here are the data structures with brief descriptions:

Csr_data_u	Data of an element (if applicable), properly set according to the type
Csr_error_info_err_s	A single, detailed error message. Used in sr_error_info_t
Csr_error_info_s	Detailed sysrepo session error information
Csr_module_ds_s	Custom datastore implementation config for each datastore and notifications of a module
Csr_val_s	Structure that contains value of an data element stored in the sysrepo datastore
Csr_xpath_ctx_s	State of xpath parsing. User must not modify nor rely on the content of the structure