In some cases, if you use an optional key data item, you must also use one or more others. In the data item descriptions in this chapter, data items that have this requirement are grouped with the other required data items in brackets and separated by a plus sign (+).
Not all result data items require a key data item. If a view contains only result data items, by default the summary is at the server level. The result data items that have only optional keys can be used with server-level data items when no key data item is included in the view.
To combine various result data items within a view, match common key data items.