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:ora_types
  ORA_VARCHAR2 ORA_STRING ORA_NUMBER ORA_LONG ORA_ROWID ORA_DATE
  ORA_RAW ORA_LONGRAW ORA_CHAR ORA_CHARZ ORA_MLSLABEL ORA_NTY
  ORA_CLOB ORA_BLOB ORA_RSET

# Build a large XML document, bind it as a CLOB,
# extract elements through PL/SQL and return as a CLOB
...
$sth->bind_param( ':in', $in_clob, { ora_type => ORA_CLOB } );
$sth->bind_param_inout( ':out', \$out_clob, 0, { ora_type => ORA_CLOB 
+} );
$sth->execute;