Advanced query options extend the capabilities of the simple search. They enable users to filter the search results by specifying restrictions based on document metadata (title, source, date, geographic location, etc.):

• The title field of the documents can be queried using the title: operator; searching for “carbon dioxide title:ocean” will only return documents which contain “ocean” in their title.
• The site: operator limits to search to a given domain; searching for “carbon dioxide site:cnn.com” returns documents on “carbon dioxide” mirrored from the CNN Web site.
• Documents in a certain time interval can be searched by using the from: and to: operators; searching for “carbon dioxide from:2010-01-01 to:2010-01-31” will only return documents published in January 2010.
• Source and target geography of the documents can be considered with the source: and target: operators; searching for “carbon dioxide source:US target:Kyoto” will return documents about carbon dioxide published in the US and referencing Kyoto as the main location in the text.