// ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    /** createdAt */
    protected LocalDateTime createdAt;

    /** docId */
    protected String docId;

We could create an instance of this class with:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[18] *}

And that way we are able to "parameterize" our dependency, that now has `"bar"` inside of it, as the attribute `checker.fixed_content`.

## Use the instance as a dependency

    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o dbfluteBeansPackageName (NotRequired - Default null)
    #  The default attribute expression of DBFlute DI configuration for Spring and Lucy.
    #
    # @SpringOnly
    #; dbfluteBeansDefaultAttribute = default-lazy-init="true"
    # - - - - - - - - - -/

    public static final String VIEW = "-view";

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    protected CrawlingConfigHelper crawlingConfigHelper;

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    /** accessType */
    protected String accessType;

    /** clientIp */
    protected String clientIp;

     * The module name is extracted from the {@code module-info.class} file if present, otherwise from
     * the {@code "Automatic-Module-Name"} attribute of the {@code META-INF/MANIFEST.MF} file if present.
     *
     * <p>A typical usage is to invoke this method for all dependencies having a
     * {@link DependencyScope#TEST TEST} or {@link DependencyScope#TEST_ONLY TEST_ONLY}

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private RelatedContentService relatedContentService;

    // ===================================================================================
    // Constant
    //

    // ===================================================================================
    // Attribute
    //
    @Resource
    private UserService userService;

    // ===================================================================================
    // Hook
    // ======

    shouldRunAfter(codeQuality)
}
tasks.check {
    dependsOn(codeQuality)
}

val rules by configurations.creating {
    isVisible = false
    isCanBeConsumed = false

    attributes {
        attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements.RESOURCES))
    }
}

val groovyVersion = GroovySystem.getVersion()

```Python hl_lines="35"
{!../../docs_src/openapi_callbacks/tutorial001.py!}
```

/// tip

Notice that you are not passing the router itself (`invoices_callback_router`) to `callback=`, but the attribute `.routes`, as in `invoices_callback_router.routes`.

///