code: package org.eclipse.milo.opcua.sdk.client.model.types.objects;
  
  import java.util.concurrent.CompletableFuture;
  
  import org.eclipse.milo.opcua.stack.core.UaException;
  
  public interface NamespacesType extends BaseObjectType {
      /**
       * Get the AddressSpaceFile {@link AddressSpaceFileType} Node, or {@code null} if it does not exist.
       * <p>
       * The Node is created when first accessed and cached for subsequent calls.
       *
       * @return the AddressSpaceFile {@link AddressSpaceFileType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      AddressSpaceFileType getAddressSpaceFileNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getAddressSpaceFileNode()}.
       *
       * @return a CompletableFuture that completes successfully with the
       * AddressSpaceFileType Node or completes exceptionally if an error occurs
       * creating or getting the Node.
       */
      CompletableFuture<? extends AddressSpaceFileType> getAddressSpaceFileNodeAsync();
  }
  