SQL> set heading off
SQL> set pagesize 0
SQL> set long 1000000
SQL> set feedback off
SQL> select
  2    dbms_metadata.get_ddl('TABLESPACE','TBLS_DATA')
  3  from
  4    dual
  5  /
ERROR:
ORA-31603: object "TBLS_DATA" of type TABLESPACE not found in schema
"JACK"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 105
ORA-06512: at "SYS.DBMS_METADATA", line 2806
ORA-06512: at "SYS.DBMS_METADATA", line 4333
ORA-06512: at line 1