(Reuters) - European shares inched lower on Tuesday as investors sifted through a mixed bag of corporate earnings and eyed latest developments on U.S.-China trade talks and Britain's progress towards some form of orderly departure from the European Union. Germany's DAX and Switzerland's SSMI both bucked the trend, with the latter helped by a 1% gain for drugmaker Novartis after it raised its 2019 targets and reported better-than-expected revenue. Another Swiss company, Apple supplier AMS ..