final String xpath = xpathConfigMap.get(XPath.DEFAULT_LANG);
        if (StringUtil.isNotBlank(xpath)) {
            return xpath;
        }
        return fessConfig.getCrawlerDocumentHtmlLangXpath();
    }

    /**
     * Gets the XPath expression for extracting content.
     *
     * @param fessConfig the Fess configuration
     * @param xpathConfigMap the XPath configuration map

        }

        // xpath.*
        public static class XPath {
            public static final String DEFAULT_LANG = "default.lang";
            public static final String DEFAULT_CONTENT = "default.content";
            public static final String DEFAULT_DIGEST = "default.digest";
            // xapth.<field>=<value>
        }

        // config.*

/**
 * Utility class for parameter operations.
 */
public class ParameterUtil {
    private static final String CIPHER_PREFIX = "{cipher}";

    /** The XPath field prefix. */
    protected static final String XPATH_PREFIX = "field.xpath.";

    /** The meta field prefix. */
    protected static final String META_PREFIX = "field.meta.";

    /** The value field prefix. */

        // Test with xpath parameters
        configParameters = "field.xpath.title=//title\nfield.xpath.content=//body";
        result = ParameterUtil.createConfigParameterMap(configParameters);
        assertEquals(2, result.get(ConfigName.XPATH).size());
        assertEquals("//title", result.get(ConfigName.XPATH).get("title"));
        assertEquals("//body", result.get(ConfigName.XPATH).get("content"));

dc:title=title:string\n\

# html

# XPath to extract main content from HTML documents.
crawler.document.html.content.xpath=//BODY
# XPath to extract language attribute from HTML documents.
crawler.document.html.lang.xpath=//HTML/@lang
# XPath to extract digest (description) from HTML documents.
crawler.document.html.digest.xpath=//META[@name='description']/@content
# XPath to extract canonical URL from HTML documents.

// Configure for file system crawling
container.singleton("fsClient", FileSystemClient.class);

// Add file URL
crawler.addUrl("file:///path/to/directory");
crawler.urlFilter.addInclude("file:///path/to/directory/.*");
```

## Configuration

### XML Configuration

Fess Crawler uses XML-based configuration with LastaFlute DI. Place configuration files in your classpath:

    /** The key of the configuration. e.g. //HTML/@lang */
    String CRAWLER_DOCUMENT_HTML_LANG_XPATH = "crawler.document.html.lang.xpath";

    /** The key of the configuration. e.g. //META[@name='description']/@content */
    String CRAWLER_DOCUMENT_HTML_DIGEST_XPATH = "crawler.document.html.digest.xpath";

```JSON
{
  "model_name": "alexnet",
  "message": "Deep Learning FTW!"
}
```

## Parámetros de path conteniendo paths { #path-parameters-containing-paths }

Imaginemos que tienes una *path operation* con un path `/files/{file_path}`.

Pero necesitas que `file_path` en sí mismo contenga un *path*, como `home/johndoe/myfile.txt`.

Entonces, la URL para ese archivo sería algo como: `/files/home/johndoe/myfile.txt`.

## Order matters { #order-matters }

When creating *path operations*, you can find situations where you have a fixed path.

Like `/users/me`, let's say that it's to get data about the current user.

And then you can also have a path `/users/{user_id}` to get data about a specific user by some user ID.

# 路徑參數 { #path-parameters }

你可以用與 Python 格式化字串相同的語法來宣告路徑「參數」或「變數」：

{* ../../docs_src/path_params/tutorial001_py310.py hl[6:7] *}

路徑參數 `item_id` 的值會作為引數 `item_id` 傳入你的函式。

所以，如果你執行這個範例並前往 [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo)，你會看到這樣的回應：

```JSON
{"item_id":"foo"}
```

## 具型別的路徑參數 { #path-parameters-with-types }

你可以在函式中使用標準的 Python 型別註記為路徑參數宣告型別：