@Override
    protected ProcessingChains newChainsInstance(TreeConfigProducer<AnyConfigProducer> parent) {
        return new ProcessingChains(parent, "processing");
    }
Root builder of the processing model

@author  bratseth
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/chains/processing/DomProcessingBuilder.java