}
        for (ClassExtensionDoc extensionDoc : plugins.values()) {
            build(extensionDoc);
            classDoc.addClassExtension(extensionDoc);
        }
    }

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

        ClassExtensionDoc extensionDoc = extensionDoc('thingo')
        PropertyDoc propertyDoc = propertyDoc('propName', id: 'propId')
        _ * targetClassDoc.classProperties >> []
        _ * targetClassDoc.classMethods >> []
        _ * targetClassDoc.classBlocks >> []
        _ * targetClassDoc.classExtensions >> [extensionDoc]
        _ * targetClassDoc.subClasses >> []

        classBlocks.add(blockDoc.forClass(this))
    }

    Collection<ClassExtensionDoc> getClassExtensions() { return classExtensions }

    void addClassExtension(ClassExtensionDoc extensionDoc) {
        classExtensions.add(extensionDoc)
    }

    List<ClassDoc> getSuperTypes() {
        return superClass == null ? interfaces : [superClass] + interfaces
    }

    Element getClassSection() { return classSection }

            methodTableRenderer.renderTo(classMethods, table);
        }
        for (ClassExtensionDoc extensionDoc : classDoc.getClassExtensions()) {
            extensionMethodsSummaryRenderer.renderTo(extensionDoc, summarySection);
        }

        if (!hasMethods(classDoc)) {
            Element para = document.createElement("para");
            summarySection.appendChild(para);

            propertyTableRenderer.renderTo(classProperties, table);
        }

        for (ClassExtensionDoc extensionDoc : classDoc.getClassExtensions()) {
            extensionPropertiesSummaryRenderer.renderTo(extensionDoc, summarySection);
        }

        if (!hasProperties(classDoc)) {
            Element para = document.createElement("para");

            blockTableRenderer.renderTo(classBlocks, table);
        }

        for (ClassExtensionDoc extensionDoc : classDoc.getClassExtensions()) {
            extensionBlocksSummaryRenderer.renderTo(extensionDoc, summarySection);
        }

        if (!hasBlocks(classDoc)) {
            Element para = document.createElement("para");
            summarySection.appendChild(para);