Here are the data structures with brief descriptions:

Cex_assembly
Cex_attribute
Cex_basis
Cex_blob
Cex_block
Cex_block_params
Cex_field
Cex_init_params
Cex_quadrature
Cex_set
Cex_set_specs
Cex_var_params
Cexi_elem_blk_parm
Cexi_file_item
Cexi_list_item
Cexi_obj_stats
Cncvar