@Override
        boolean serialize(StringBuilder destination, WeakAndItem item) {
            if (needsAnnotationBlock(item)) {
                destination.append("({");
            }
            if (item.nIsExplicit()) {
                destination.append(TARGET_NUM_HITS).append(": ").append(item.getN());
            }
            if (needsAnnotationBlock(item)) {
                destination.append("}");
            }
            destination.append(WEAK_AND).append('(');
            return true;
        }
Serialize Vespa query trees to YQL+ strings.

@author Steinar Knutsen
container-search/src/main/java/com/yahoo/search/yql/VespaSerializer.java