private void deriveImportedAttributes(ImmutableSDField field) {
        for (Attribute attribute : field.getAttributes().values()) {
            if (!importedAttributes.containsKey(field.getName())) {
                importedAttributes.put(field.getName(), attribute);
            }
        }
    }
Derives one attribute. TODO: Support non-default named attributes
config-model/src/main/java/com/yahoo/schema/derived/AttributeFields.java