How to export only data or only metadata using expdp

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CONTENT parameter of expdp let you select whether you want to export only data or only metadata or both
Default: ALL
Syntax and Description
CONTENT=[ALL | DATA_ONLY | METADATA_ONLY]

DATA_ONLY exports only table row data; no database object definitions are exported.
METADATA_ONLY exports only database object definitions; no table row data is exported.

Exporting metadata only

$ cat exp_full_pdb01.par
directory=dump
dumpfile=EXP_PDB01_FULL%U.dmp
logfile=EXP_PDB01_FULL.log
full=y
CONTENT=METADATA_ONLY

$ expdp system@PDB01 parfile=exp_full_pdb01.par

Exporting data only

directory=dump
dumpfile=EXP_PDB01_FULL%U.dmp
logfile=EXP_PDB01_FULL.log
full=y
CONTENT=DATA_ONLY

$ expdp system@PDB01 parfile=exp_full_pdb01.par

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