This flag indicates which structure is located in the data part of a transport record.
BLANK: Data record T : Transport header (DD structure JTRHD) C : Control command file comment. This record is not functional. H : Object header (DD structure JHEAD) E : End of object (applies only to objects H and N) F : End of sequential dataset N : Header for object data structure description data (DD structure JHEAD). The lines of data which then follow have the structure JNAME. * : Comment (no function) L : LIMU internal (command file structure) (DD structure JLIMU) U : LIMU-specific information for compatibility I : Info for seq. data carrier (DD structure JSINF) P : Info for program identifier (DD structure JPROG)