Oracle 18c

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create or replace TYPE "MY_ST_GEOMETRY" Authid current_user  AS object(
  entity integer,
  numpts integer,
  minx float(64),
  miny float(64),
  maxx float(64),
  maxy float(64),
  minz float(64),
  maxz float(64),
  minm float(64),
  maxm float(64),
  area float(64),
  len float(64),
  srid integer,
  points blob,

  constructor Function my_st_geometry(
    SELF IN OUT NOCOPY my_st_geometry,
    geom_str clob,
    srid number
  ) Return self AS result deterministic,
  
  constructor Function my_st_geometry(
    SELF IN OUT NOCOPY my_st_geometry,
    x     number,
    y     number,
    z     number,
    m     number,
    srid  integer
  ) Return self AS result deterministic
) NOT final;
SELECT * FROM user_errors;
create or replace TYPE BODY "MY_ST_GEOMETRY" IS
  constructor Function my_st_geometry(
    SELF IN OUT NOCOPY my_st_geometry,
    geom_str clob,
    srid number
  ) Return self AS result deterministic
  IS
  BEGIN
    RETURN;
  END;
  
  constructor Function my_st_geometry(
    SELF IN OUT NOCOPY my_st_geometry,
    x     number,
    y     number,
    z     number,
    m     number,
    srid  integer
  ) Return self AS result deterministic
  IS
  BEGIN
    SELF.minx := x;
    SELF.maxx := x;
    SELF.miny := y;
    SELF.maxy := y;
    SELF.minz := z;
    SELF.maxz := z;
    SELF.minm := m;
    SELF.maxm := m;
    SELF.srid := srid;
    RETURN;
  END;
END;
/
SELECT * FROM user_errors;
create table polygons (
    id int,
    shape my_st_geometry
)
insert into polygons (id, shape ) VALUES (
 1,
 my_st_geometry('polygon ((52 28,58 28,58 23,52 23,52 28))', 4326)
);
1 rows affected