}

    List<PropertyDoc> getExtensionProperties() {
        List<PropertyDoc> properties = []
        mixinClasses.each { mixin ->
            mixin.classProperties.each { prop ->
                properties << prop.forClass(targetClass)
            }
        }
        extraProperties.each { prop ->
            properties << prop.forClass(targetClass)
        }
        return properties.sort { it.name }
    }

        } else  {
            current.appendChild(document.importNode(node, true))
        }
    }

    def appendChildren(Iterable<? extends Node> nodes) {
        nodes.each { appendChild(it) }
    }

    def appendChildren(NodeList nodes) {
        nodes.each { appendChild(it) }
    }

    def text(String text) {
        current.appendChild(document.createTextNode(text))
    }

        format(nodes, true)
    }

    def format(Iterable<? extends Node> nodes, boolean prettyPrint = false) {
        StringBuilder builder = new StringBuilder()
        nodes.each { node ->
            format(node, builder, 0, prettyPrint, prettyPrint)
        }
        return builder.toString()
    }

    def format(Node node, Appendable target, int depth, boolean prettyPrint, boolean indentSelf) {

        Map<String, CtClass> result = [:]
        collect(result, c)
        return result
    }

    private void collect(Map<String, CtClass> result, CtClass c) {
        c.interfaces.each { result.put(it.name, it) }

        if (c.superclass != null) {
            collect(result, c.superclass)
        }
    }

    private List<String> filterChangesToReport(CtClass c, Map<String, CtClass> interfaces) {