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Advanced Search (including boolean options are ) is already supported in the DSpace 7 search page. Boolean keywords can be used, and you can also specify to search within specific fields by name. Some examples:

• Searching test power will return results with both these words in them (this is equivalent to an "AND" boolean search). E.g. https://demo7.dspace.org/search?query=test%20power
• Searching test AND power will return results with both these words in them. E.g. https://demo7.dspace.org/search?query=test%20AND%20power
• Searching test OR power will return results with either of these words in them. E.g. https://demo7.dspace.org/search?query=test%20OR%20power
• Searching test NOT power will return results with "test" but not including "power". E.g. https://demo7.dspace.org/search?query=test%20NOT%20power
• Searching "test power" (in quotes) will return results with the exact phrase "test power" in them. E.g. https://demo7.dspace.org/search?query=%22test%20power%22
• Searching dc.title:test will only return results where the dc.title includes "test". E.g. https://demo7.dspace.org/search?query=dc.title:test
• Searching dc.title:test AND dc.description.abstract:green will only return results where the dc.title field includes "test" and the dc.description.abstract field returns "green". E.g. https://demo7.dspace.org/search?query=dc.title:test%20and%20dc.description.abstract:green