alias FileInfo for filtering
A specific file representation
Operations upon a set of files
Supports a model a bit like CSS selectors, where a selection of operands is made before applying some operation. For example:
Handler for folder operations. Needs some work ...
Operations upon a set of folders
Would be used for things like zip files, where the implementation mantains the contents in memory or on disk, and where the actual zip file isn't/shouldn't be written until one is finished filling it up (for zip due to inefficient file format).