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Please note that the  triggering files cannot be located on the FTP.
fileNamePatternFilter
Option to filter files that need to be imported based on their filename. This can be useful if there are files in the import folder that should not be imported:
e.g *.xml to skip non xml files. Only the * and ? wild cards are recognized.
Another usecase is when you are importing a large number of big files which FEWS cannot import all at once due to memory issues (eg reanalysis data). In this case you can use the T0 of the system to filter out files you want to import in one run:
eg: <fileNamePatternFilter>%TIME_ZERO(yyyy)%??????.nc</fileNamePatternFilter>
fileNameObservationDateTimePattern
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