*
 * // Check if child exists
 * boolean hasVersion = parent.child("version").isPresent();
 *
 * // Get child text content
 * String version = parent.child("version")
 *     .map(Element::textContent)
 *     .orElse(null);
 *
 * // Get trimmed text content
 * String trimmedVersion = parent.child("version")
 *     .map(Element::textContentTrimmed)
 *     .orElse(null);
 *

    public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initializing {}", this.getClass().getSimpleName());
        }
        osddFile = getOsddFile();
    }

    /**
     * Gets the OSDD file.
     *
     * @return the OSDD file
     */
    protected File getOsddFile() {
        if (!isOsddLinkEnabled()) {
            logger.debug("OSDD is disabled.");
            return null;
        }

          <type>DOM</type>
        </field>
      </fields>
      <codeSegments>
        <codeSegment>
          <version>1.0.0+</version>
          <code>
            <![CDATA[
    /**
     * Gets the identifier of the extension.
     *
     * @return The extension id in the form {@code <groupId>:<artifactId>:<version>}, never {@code null}.
     */
    public String getId() {

  }

  /** Factory for byte or char sinks. */
  interface SinkFactory<S, T> extends SourceSinkFactory<S, T> {

    /** Creates a new sink. */
    S createSink() throws IOException;

    /** Gets the current content of the created sink. */
    T getSinkContents() throws IOException;
  }

  /** Factory for {@link ByteSource} instances. */
  interface ByteSourceFactory extends SourceFactory<ByteSource, byte[]> {}

import org.junit.Test;
import org.junit.runner.RunWith;

/**
 * OkHttp.
 *
 * https://square.github.io/okhttp/
 */
@RunWith(AndroidJUnit4.class)
public class OkHttpClientTest {
  @Test public void get() throws IOException {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
        .url("https://google.com/robots.txt")
        .build();

import org.apache.maven.artifact.repository.ArtifactRepository;

/**
 * MavenMetadataCache
 */
@Deprecated
public interface MavenMetadataCache {

    ResolutionGroup get(
            Artifact artifact,
            boolean resolveManagedVersions,
            ArtifactRepository localRepository,
            List<ArtifactRepository> remoteRepositories);

    void put(

But you still need to define what is the dependable, the callable that you pass as a parameter to `Depends()` or `Security()`.

There are multiple tools that you can use to create those dependables, and they get integrated into OpenAPI so they are shown in the automatic docs UI, they can be used by automatically generated clients and SDKs, etc.

You can import them from `fastapi.security`:

```python
from fastapi.security import (

from typing import Annotated

import pytest
from fastapi import Body, FastAPI, Query
from fastapi.testclient import TestClient

app = FastAPI()


@app.post("/")
async def get(
    x: Annotated[float, Query(allow_inf_nan=True)] = 0,
    y: Annotated[float, Query(allow_inf_nan=False)] = 0,
    z: Annotated[float, Query()] = 0,
    b: Annotated[float, Body(allow_inf_nan=False)] = 0,
) -> str:
    return "OK"

    if (match) {
        return "https://golang.org/change/" + match[1];
    }

    if (pkgRE.test(t)) {
        // TODO: make this smarter, using a list of packages + substring matches.
        // Get the list from godoc itself in JSON format?
        return "https://golang.org/pkg/" + t;
    }

    return null;

passage, not much larger than a rat-hole:  she knelt down and
looked along the passage into the loveliest garden you ever saw.
How she longed to get out of that dark hall, and wander about
among those beds of bright flowers and those cool fountains, but
she could not even get her head though the doorway; `and even if
my head would go through,' thought poor Alice, `it would be of
very little use without my shoulders.  Oh, how I wish