Evaluate most matching descriptor between given or empty and file extension most suitable format, it can return One of module.DescriptorTypeValue or "UNKNOWN", if no format is pecified and none taken from the file extension, or <default-extension-format><-<file-extension-format> in case there is not match with required format.

Get(s) the given target file for loading the Feed.

Parse Command line arguments.

Verify a command line request for Help() or Usage().

Print Usage of the command.

Interface that describes Bootstrap Component behaviors.