This Java service creates a new item in a document and optionally sets the item value. If an item of the same name already exists in a document, appendItemValue creates a second item of the same name, and the duplicate items are not accessible through most methods. If you are creating a new document, appendItemValue is safe. Otherwise replaceItemValue should be used. The parameter value is optional. The value may be the of type Integer Object, Double object or any Object. The data type of the new item depends upon the data type of the value placed in it.