public String argumentsString() {
        var sb = new StringBuilder();
        if (id != null && !id.isEmpty())
            sb.append(" ").append(id);

        arguments.forEach(arg -> sb.append(" ").append(arg));
        return sb.toString();
    }
A collection of components of a single type, of which one is selected.

@author bratseth
indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/SelectedComponent.java