Where is the location of rdbms alertlog

Can you please tell me the location of rdbms alertlog
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in 11g and higher this will return the directory  for either rdbms or asm

             FROM v$parameter
            WHERE name = 'diagnostic_dest')
       || '/diag/'
             FROM v$parameter
            WHERE name = 'instance_type')
       || '/'
       || LOWER(SYS_CONTEXT('userenv', 'db_unique_name'))
       || '/'
       || SYS_CONTEXT('userenv', 'instance_name')
       || '/trace'

if you want the xml version of the alert log, then  change /trace  to /xml

for 10g and lower

  select value from v$parameter where name = 'background_dump_dest'

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