- condition format: "(attribute__lookup=value)"
- conditional phrase: ((condition1) WHITE_SPACE and/or WHITE_SPACE ((condition2) WHITE_SPACE and/or WHITE_SPACE (condition3)) ... )
- not conditions: "(not WHITE_SPACE (condition))"
- example 1: ((title__icontains=performance) and (year__gte=2021))
- example 2: ((title__icontains=performance) and (authors__last_name=Abdullah)) or (index_keywords__name__iexact=performance analysis)
- example 3: ((year__gte=2014) and (not (event__type=Conference Paper)))
- For more lookups please check Django Lookup