XML　concurrency　control　protocol　(CCP)　is　used　to　guard　the　consistence　and　isolation　of　transactions　in　Native　XML　databases.　Experiments　show　that　locking　overhead　of　existing　approaches　based　on　locking　may　be　huge,　especially　in　the　applications　with　few　or　without　conflicts.　Optimistic　concurrency　control　(OCC)　is　an　alternative　to　locking.　This　paper　presents　a　new　optimistic　approach　for　concurrency　control　over　XML　documents　named　FOCCX　(Forward　oriented　Optimistic　Concurrency　Control　over　XML)　facing　XPath-based　API.　FOCCX　increases　the　degree　of　transaction　concurrency.　This　is　achieved　by　aborting　the　current　transaction　when　a　potential　UPDATE-UPDATE　conflict　taking　place　as　early　as　possible,　and　reduces　comparison　times　by　checking　a　small　write　set　against　read　set　of　a　limited　number　of　concurrent　transactions.　Experimental　results　show　that　our　protocol　has　superior　performance　to　approaches　based　on　Backward　Oriented　mechanism　(BOCC).　©　2015　SERSC.