They are not specified in an SQL like language, but directly in . They are navigational because you may nest properties in navigational paths, something like:
SELECTFROM Employee
WHERE country.code = 'US'
ODER BY company.name
This will result in SQL with JOINs for country on countryId and for company on companyId. For how to specify such a query in filter objects, see How to create and use filters.
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