code: public ChildChannelDataImpl createChild() {
          String childName = this.name + CHILD_STRING + nextChildId();
          ChildChannelDataImpl child = new ChildChannelDataImpl(childName, this);
          this.children.add(child);
          return child;
      }
docs: Create a child data object. Add it to the list of children and return it.
  
  @return child channel data object