The　wide　use　of　XML　has　necessitated　the　XML　document　semantically　richer.　The　integrity　constraints　play　an　important　role　in　relational　world.　And　the　integrity　constraints　for　XML　have　been　widely　investigated　over　the　past　few　years.　There　are　a　few　researches　on　multivalued　dependencies　for　XML　(XMVDs)　and　most　of　them　are　based　on　paths.　In　this　paper,　we　propose　a　novel　approach　for　defining　XMVDs　in　XML　Schema.　We　introduce　＇participant＇　to　organize　the　involved　information　items　that　are　divided　into　three　groups　called　determinant,　dependency　and　codependency　in　our　extension.　Two　existing　components,　selector　and　field,　are　used　to　locate　the　information　items,　which　uses　restricted　XPath　as　path　description　language.　In　particular,　we　extend　the　semantics　of　the　field　component　to　support　a　set　(list)　of　nodes　and　node　with　complex　type.　Related　issues　are　discussed,　such　as　comparing　element　nodes　with　complex　type.　©2010　IEEE.