docs: public CrawlElement withAttribute(String attributeName, String value) {
  		if (this.underXpath == null || this.underXpath.isEmpty()) {
  			this.underXpath = "//" + this.tagName + "[@" + attributeName + "='" + value + "']";
  		} else {
  			this.underXpath = this.underXpath + " | " + "//" + this.tagName + "[@" + attributeName
  					+ "='" + value + "']";
  		}
  		return this;
  	}