private String computeId() {
            StringBuilder textForId = new StringBuilder();
            textForId.append(this.url);
            textForId.append("-");
            textForId.append(this.timestampCrawl);
            return DigestUtils.sha256Hex(textForId.toString()).toUpperCase();
        }
Represents a web page according the CDRv3 schema.
ache-tools/src/main/java/achecrawler/memex/cdr/CDR3Document.java