Defines the type of search that is performed.
|ItemsOnly||Return only the items responsive to the search terms.|
|Descendants||Return only the descendants of the items responsive to the search terms.|
|Families||Find entire families.|
|ItemsAndDescendants||Same as Descendants, but including the items responsive to the search terms.|
|ItemsAndDuplicates||Finds items and their duplicates.|
|ThreadItems||Items responsive to the search terms and all items in the same discussion threads.|
|TopLevelItems||Returns the top-level items for the collection returned by a search.|