A PL/I host structure name can be a structure name. For example:
dcl 1 A,
      2  B,
        3  C1 char(...),
        3  C2 char(...);
            In this example, B is the name of a host structure consisting of the scalar members C1 and C2.
However, structures (whether level 1 structures or substructures) may not be referenced in SQL statements. Only scalar members may be so referenced.
A fully qualified member name must be no more than 30 characters in length.