what should i do with this exmple?

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import com.nortal.jroad.example.client.types.eu.x_road.naidis.AttachmentEchoResponse;
import com.nortal.jroad.example.client.types.eu.x_road.naidis.EchoRequest;
import com.nortal.jroad.example.client.types.eu.x_road.naidis.EchoResponse;

what is this ".types.eu.x......"? i dont konw . the example process cant run