docs: protected void addLabelForNumbers(ItemIdValue itemIdValue) {
  
  		String qid = itemIdValue.getId();
  
  		try {
  			// Fetch the online version of the item to make sure we edit the
  			// current version:
  			ItemDocument currentItemDocument = (ItemDocument) dataFetcher
  					.getEntityDocument(qid);
  			if (currentItemDocument == null) {
  				System.out.println("*** " + qid
  						+ " could not be fetched. Maybe it has been deleted.");
  				return;
  			}
  
  			// Check if we still have exactly one numeric value:
  			QuantityValue number = currentItemDocument
  					.findStatementQuantityValue("P1181");
  			if (number == null) {
  				System.out.println("*** No unique numeric value for " + qid);
  				return;
  			}
  
  			// Check if the item is in a known numeric class:
  			if (!currentItemDocument.hasStatementValue("P31", numberClasses)) {
  				System.out
  						.println("*** "
  								+ qid
  								+ " is not in a known class of integer numbers. Skipping.");
  				return;
  			}
  
  			// Check if the value is integer and build label string:
  			String numberString;
  			try {
  				BigInteger intValue = number.getNumericValue()
  						.toBigIntegerExact();
  				numberString = intValue.toString();
  			} catch (ArithmeticException e) {
  				System.out.println("*** Numeric value for " + qid
  						+ " is not an integer: " + number.getNumericValue());
  				return;
  			}
  
  			// Construct data to write:
  			ItemDocumentBuilder itemDocumentBuilder = ItemDocumentBuilder
  					.forItemId(itemIdValue).withRevisionId(
  							currentItemDocument.getRevisionId());
  			ArrayList<String> languages = new ArrayList<>(
  					arabicNumeralLanguages.length);
  			for (int i = 0; i < arabicNumeralLanguages.length; i++) {
  				if (!currentItemDocument.getLabels().containsKey(
  						arabicNumeralLanguages[i])) {
  					itemDocumentBuilder.withLabel(numberString,
  							arabicNumeralLanguages[i]);
  					languages.add(arabicNumeralLanguages[i]);
  				}
  			}
  
  			if (languages.size() == 0) {
  				System.out.println("*** Labels already complete for " + qid);
  				return;
  			}
  
  			logEntityModification(currentItemDocument.getEntityId(),
  					numberString, languages);
  
  			dataEditor.editItemDocument(itemDocumentBuilder.build(), false,
  					"Set labels to numeric value (Task MB1)");
  		} catch (MediaWikiApiErrorException e) {
  			e.printStackTrace();
  		} catch (IOException e) {
  			e.printStackTrace();
  		}
  	}