});
    }

    private static <T> Map<AccessorKey, T> diff(Map<AccessorKey, T> first, Map<AccessorKey, T> second) {
        return first.entrySet().stream()
            .filter(e -> !second.containsKey(e.getKey()))
            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
    }

        }

        @Override
        public boolean onStartElement(String elementName, Map<String, String> attributes) {
            if (!elementName.equals("a") || !attributes.containsKey("name")) {
                return false;
            }
            Element element = document.createElement("anchor");
            String id = String.format("%s.%s", classMetaData.getClassName(), attributes.get("name"));

            } else if (blockElements.contains(name)) {
                unwindTo("p", visitor);
            } else if (!blockContent.contains(name) && !(name.equals("a") && attributes.containsKey("name"))) {
                onInlineContent();
            }

            elementStack.addFirst(name);
            visitor.onStartHtmlElement(name);

        String name = jApiMethod.getName();
        if (!pattern.matcher(name).matches()) {
            return false;
        }
        return upgradedMethods.containsKey(AccessorKey.ofOldMethod(jApiMethod));
    }

    private static boolean isCurrentGetterOfUpgradedProperty(JApiMethod jApiMethod, Map<AccessorKey, UpgradedProperty> currentMethods) {