Field values of table or query records linked with a feature can be used in a filter condition. The very facts of presence of a record linked with the feature and of non-emptiness of the specified field value can also be checked.
If the feature type is linked with a table by a multiple link, then used relation variant is to be specified: whether the relation should be satisfied for any linked record, for each record, for the sum of values of all records and so on.
