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| Static Outputs Determinable from Inputs | ||
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| In cases when the number of output files varies, but can be determined based upon a user's parameter selection, the use of the filter tag can be used. The text contents of the ``<filter>`` tag are ``eval`` ed and if the expression is ``True`` a dataset will be created as normal. If the expression is ``False``, the output dataset will not be created; instead a ``NoneDataset`` object will be created and made available. When used on the command line the text ``None`` will appear instead of a file path. The local namespace of the filter has been populated with the tool parameters. |
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parameter selection, the use of the filter tag can be used. -> parameter selection, the filter tag can be used.
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Excellent job, this is a good resource @jmchilton. |
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Thanks for the review @mvdbeek - I've incorporated your comments into the pull request. I'm just waiting on one passing Travis check for any of these. |
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