[GeoNetwork-users] Using PostgreSQL/PostGIS in 4.0.3

Trying to configure this I encountered this syntax for the jdbc.properties.

jdbc.username=#{systemEnvironment['GEONETWORK_DB_USERNAME']?:'www-data'}
jdbc.password=#{systemEnvironment['GEONETWORK_DB_PASSWORD']?:'www-data'}
jdbc.database=#{systemEnvironment['GEONETWORK_DB_NAME']?:'~/gn'}
jdbc.host=#{systemEnvironment['GEONETWORK_DB_HOST']?:'localhost'}
jdbc.port=#{systemEnvironment['GEONETWORK_DB_PORT']}
jdbc.connectionProperties=#{systemEnvironment['GEONETWORK_DB_CONNECTION_PROPERTIES']}

And I am confused. If GEONETWORK_DB_PORT shall be substituted for

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