Clear or Delete Htree Data from Htree View

PROCEDURE Prc_Clear_Htree_Data(P_Tree_item varchar2,
P_Search_String varchar2)
IS
/*
* P_Tree_item - Htree Item.
* P_Search_String - Tree Node Label that which you want to Delete/Clear.
* give the exact node label (Character must be same).
*
* This Procedure will clear or delete Tree View from your given
* search_string & child node.
*/
Htree Item;
DeleteNode FTREE.NODE;
ItemName Varchar2(30) :=p_Tree_item;
vSearchString Varchar2(200):=p_Search_String;

BEGIN
Htree := FIND_ITEM(ItemName);

DeleteNode := FTREE.FIND_TREE_NODE(htree,vSearchString,FTREE.FIND_NEXT ,
FTREE.NODE_LABEL,
FTREE.ROOT_NODE ,
FTREE.ROOT_NODE
);
IF NOT FTREE.ID_NULL(DeleteNode)
THEN FTREE.DELETE_TREE_NODE(Htree, DeleteNode);
END IF;
END;