public Annotations annotate(AnnotationClass clazz) {
        Annotations annotations = this.annotations.get(clazz);
        if (!this.annotations.containsKey(clazz)) {
            annotations = new Annotations(this);
            this.annotations.put(clazz, annotations);
        }
        return annotations;
    }
Returns the text that this spans is
container-search/src/main/java/com/yahoo/text/interpretation/Span.java