operator

- Return type:
- Switch
- Returns:
- True if the notation has a name from the specified list and false otherwise. Replacing "=" with "!=" will reverse the results.

notation (=|!=) (notation-name|notation-name-list)

The `notation =`

test returns true if its name is one of those given as the *notation-name* or given in the *notation-name-list*. The *notation-names* must be either constant quoted strings or OmniMark names.