# Filter by Class

### Description
Selects objects by the value of their type relation (the instances of a class).
Use this for example to select all persons. The class should be provided in the parameter.

### Input
- `SOURCE [OBJ]`: the list of objects to filter

### Output
- `TRUE [OBJ]`: the objects for which the selection applies
- `FALSE [OBJ]`: the objects for which the selection does not apply

### Parameters
- `Class`: the identifier of the class to select
- `Use sub-classes`: when set to `true`, all sub-classes of the given one are also considered. Sub-classes can be defined in the data with the `rdfs:subClassOf` relation.

Output scores can be [aggregated](docs://score_aggregation) and/or [normalised](docs://score_normalisation).