@Override
    public final String getEncoding() {
        return null;
    }
Returns whether this data element should be rendered.
This can be overridden to add new kinds of data which should not be rendered.
This default implementation returns true unless the data is instanceof ResponseHeaders.

@return true to render it, false to skip completely
container-core/src/main/java/com/yahoo/processing/rendering/ProcessingRenderer.java