EntityValidationException::MESSAGES_SEPARATOR
The separator for combining multiple messages into a single string.
Afterwards, the separator could be used to split a concatenated string onto multiple lines.
explode(EntityValidationException::MESSAGES_SEPARATOR, $messages);
  
File
- 
              core/
modules/ migrate/ src/ Exception/ EntityValidationException.php, line 25  
Class
- EntityValidationException
 - To throw when an entity generated during the import is not valid.
 
Namespace
Drupal\migrate\ExceptionCode
const MESSAGES_SEPARATOR = '||';
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