create type question....

I create a data type as follows:

create type baseobject as (grp integer, elem integer,
len integer, dta bytea);

I then wish to make a table of these:

create table image (obj baseobject);

however the table creation fails with this error
message:

ERROR: column "obj" has composite type baseobject

If I can't use composite data types in tables what is
the use of a composite data type?

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