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Rather than trying to choose the language that is the best at everything ( which is probably impossible ) , SWIG allows a user to use the best language for the job at hand . Whatever attributes the user subsequently asked the server to apply to their key , the server would also apply the " shell " attribute , rendering it impossible for the user to use a shell . " This document recommends that any future XML based languages which have presentational information ( whether visual , aural , tactile or other ) also add a STYLE attribute which similarly permits the user to use CSS to style the document and elements in documents written in that language . Is it better to allow the user to use the system the way THEY would want to ? Using the above format allows the user to use a units_order report as a unit_file input .