package Ġse . w art ing . signature core Ċ Ċ /** Ċ Ġ* ĠMark s Ġdeclarations Ġthat Ġare Ġstill Ġ** experimental ** Ġin Ġsignature ĠAPI , Ġwhich Ġmeans Ġthat Ġthe Ġdesign Ġof Ġthe Ċ Ġ* Ġcorresponding Ġdeclarations Ġhas Ġopen Ġissues Ġwhich Ġmay Ġ( or Ġmay Ġnot ) Ġlead Ġto Ġtheir Ġchanges Ġin Ġthe Ġfuture . Ċ Ġ* ĠR ough ly Ġspeaking , Ġthere Ġis Ġa Ġchance Ġthat Ġthose Ġdeclarations Ġwill Ġbe Ġdeprecated Ġin Ġthe Ġnear Ġfuture Ġor Ċ Ġ* Ġthe Ġsemantics Ġof Ġtheir Ġbehavior Ġmay Ġchange Ġin Ġsome Ġway Ġthat Ġmay Ġbreak Ġsome Ġcode . Ċ Ġ*/ Ċ @ Must Be Document ed Ċ @ Retention ( value Ġ= ĠAnnotation Retention . BINARY ) Ċ @ Requires Opt In ( level Ġ= ĠRequires Opt In . Level . WARNING ) Ċ annotation Ġclass ĠExperimental Signature Api Ċ