*/
    public abstract ConfigurableFileCollection getCssFiles();

    /**
     * The source code to be documented. This should be the "public" APIs.
     */
    public abstract ConfigurableFileCollection getDocumentedSource();

    /**
     * Source code root folders. Java, Groovy and Kotlin public API sources, including
     * generated code.
     */
    public abstract ConfigurableFileCollection getSourceRoots();

    /**

        TaskProvider<ExtractDslMetaDataTask> dslMetaData = tasks.register("dslMetaData", ExtractDslMetaDataTask.class, task -> {
            task.source(extension.getDocumentedSource());
            task.getDestinationFile().convention(dslReference.getStagingRoot().file("dsl-meta-data.bin"));
        });

        extension.getClasspath().from(runtimeClasspath);
        extension.getSourceRoots().from(sourcesPath.getIncoming().artifactView(v -> v.lenient(true)).getFiles());
        extension.getDocumentedSource().from(sourcesPath.getIncoming().artifactView(v -> v.lenient(true)).getFiles().getAsFileTree().matching(f -> {
            f.include(PublicApi.INSTANCE.getIncludes());
            // Filter out any non-public APIs

        javaSourceSet.register("java_api", spec -> {
            spec.getDisplayName().set("API");
            spec.getSourceRoots().from(extension.getDocumentedSource());
            spec.getClasspath().from(extension.getClasspath());
            spec.getIncludes().from(extension.getSourceRoot().file("kotlin/Module.md"));
            configureSourceLinks(project, extension, spec);