Thesl：shoppingListandsl：itemtagsoutputashoppinglisttotheresponseandareusedasfollows：11.<sl：shoppingList>12.<sl：itemname="Bread"/>13.<sl：itemname="Milk"/>14.<sl：itemname="Eggs"/>15.</sl：shoppingList>Thetaghandlerforsl：shoppingListisShoppingListTagandthetag
题目
Thesl：shoppingListandsl：itemtagsoutputashoppinglisttotheresponseandareusedasfollows：11.<sl：shoppingList>12.<sl：itemname="Bread"/>13.<sl：itemname="Milk"/>14.<sl：itemname="Eggs"/>15.</sl：shoppingList>Thetaghandlerforsl：shoppingListisShoppingListTagandthetaghandlerforsl：itemisItemSimpleTag.ShoppingListTagextendsBodyTagSupportandItemSimpleTagextendsSimpleTagSupport.Whichistrue？（）
A.ItemSimpleTagcanfindtheenclosinginstanceofShoppingListTagbycallinggetParent（）andcastingtheresulttoShoppingListTag.
B.ShoppingListTagcanfindthechildinstancesofItemSimpleTagbycallingsuper.getChildren（）andcastingeachtoanItemSimpleTag.
C.ItisimpossibleforItemSimpleTagandShoppingListTagtofindeachotherinataghierarchybecauseoneisaSimpletagandtheotherisaClassictag.
D.ShoppingListTagcanfindthechildinstancesofItemSimpleTagbycallinggetChildren（）onthePageContextandcastingeachtoanItemSimpleTag.
E.ItemSimpleTagcanfindtheenclosinginstanceofShoppingListTagbycallingfindAncestorWithClass（）onthePageContextandcastingtheresulttoShoppingListTag.