if (propertyDoc.getDescription() == null) {
                throw new RuntimeException(String.format("Docbook content for '%s.%s' does not contain a description paragraph.", classDoc.getName(), propName));
            }

            props.put(propName, propertyDoc);
        }

        for (PropertyDoc propertyDoc : props.values()) {

            }
            classExtensionDoc.getExtensionClasses().put(extension.getExtensionId(), model.getClassDoc(extension.getExtensionClass()));
        }
        for (ClassExtensionDoc extensionDoc : plugins.values()) {
            build(extensionDoc);
            classDoc.addClassExtension(extensionDoc);
        }
    }

    private void build(ClassExtensionDoc extensionDoc) {
        Document doc;
        try {

            cl.call(new Object[]{entry.getKey(), entry.getValue()});
        }
    }

    public void each(Action<? super T> action) {
        for (T t : classes.values()) {
            action.execute(t);
        }
    }

        }
    }

    private static void initExecutionMode(String[] args) {
        if (args.length != 1) {
            throw new IllegalArgumentException("Requires 1 param: " + Stream.of(ExecutionMode.values()).map(ExecutionMode::toString).collect(Collectors.joining("/")));
        }
        executionMode = ExecutionMode.valueOf(args[0]);

        return declaredProperties.keySet();
    }

    public Set<PropertyMetaData> getDeclaredProperties() {
        return new HashSet<PropertyMetaData>(declaredProperties.values());
    }

    public Set<MethodMetaData> getDeclaredMethods() {
        return declaredMethods;
    }

    public Set<String> getDeclaredMethodNames() {
        Set<String> names = new HashSet<String>();

            int columns = 3;
            if (classDoc.getSubClasses().size() <= 3) {
                // if there are only 3 or fewer known subtypes, render them
                // in a single column
                columns = 1;
            }
            simplelist.setAttribute("columns", String.valueOf(columns));
            simplelist.setAttribute("type", "vert");

        if (metaData != null) {
            return metaData;
        }

        List<MethodLinkMetaData> candidates = new ArrayList<MethodLinkMetaData>();
        for (MethodLinkMetaData methodLinkMetaData : methods.values()) {
            if (methodLinkMetaData.name.equals(method)) {
                candidates.add(methodLinkMetaData);
            }
        }
        if (candidates.isEmpty()) {