1. Equal search
  1-1. elements: Li
  → To search for datasets that contain elements 'Li'
  1-2. nsites : 3
  → To search for datasets that contain nsites '3'
2. AND operator
  2-1. elements: Li AND elements: O
  → To search for datasets that must contain elements 'Li' and 'O'
  2-2. elements: Li AND nsites : 1
  → To search for datasets that must contain elements 'Li'
    and nsites '1'
3. OR operator
  3-1. elements: Li OR elements: O
  → To search for datasets that contain elements 'Li' or 'O'
  3-2. elements: Li OR nsites: 2
  → To search for datasets that contain elements 'Li'
    or nsites '2'
4. NOT operator
  4-1. elements: Li NOT elements: O
  → To search for datasets that contain elements 'Li'
    but not 'O'
5. Range search
  5-1. nsites: [1 TO 5]
  → To search for datasets that nsites are between 1 to 5
    (For Integer)
  5-2. density: [1.0 TO 5.0]
  → To search for datasets that density are between 1.0 to 5.0
    (For Float)
6. Advanced
  6-1. elements: Li AND nsites: [1 TO 5]
  → To search for datasets that must contain elements 'Li' and
    nsites 1 to 5 (For Integer)
  6-2. elements: Li AND density: [1.0 TO 5.0]
  → To search for datasets that must contain elements 'Li' and
    density 1.0 to 5.0 (For Float)
  6-3. (elements: Li OR elements: O) AND elements: Si
  → To search for datasets that must contain elements 'Si' and
    either 'Li' or 'O'