*
 * <p>Fields:</p>
 * <ul>
 *   <li>{@code logger} - Logger instance for logging warnings.</li>
 *   <li>{@code PREFIX} - Prefix for the temporary file name.</li>
 *   <li>{@code SUFFIX} - Suffix for the temporary file name.</li>
 *   <li>{@code done} - Flag indicating whether the file has been retrieved.</li>
 * </ul>
 *
 * <p>Constructors:</p>
 * <ul>

     *
     * @param session the {@link Session}, must not be {@code null}
     * @param installationToolchainsFile The {@link Source} pointing to the installation toolchains, must not be {@code null}
     * @param userToolchainsSource The {@link Source} pointing to the user toolchains, must not be {@code null}
     * @throws ToolchainsBuilderException if the project cannot be created

- <a href="https://jinja.palletsprojects.com" target="_blank"><code>jinja2</code></a> - 使用預設的模板配置時必須安裝。
- <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - 需要使用 `request.form()` 對表單進行<abbr title="轉換來自表單的 HTTP 請求到 Python 資料型別"> "解析" </abbr>時安裝。

  <description><![CDATA[
    <p>Per-directory repository metadata <code>repository-metadata.xml</code>.</p>
    <p>A directory may represent 3 types of content: "groupId", "groupId/artifactId" or "groupId/artifactId/version".</p>
    <p>Most metadata content has a meaning when the directory represents a "groupId/artifactId" (<code>groupId</code>, <code>artifactId</code>, <code>versioning</code>)<p>]]>
  </description>
  <defaults>
    <default>

			return 0, err
		}
		return 0, fmt.Errorf("no exit code (in %q)", string(b))
	}

	// Parse the exit code.
	code, err := strconv.Atoi(string(match[1]))
	if err != nil {
		// Something is malformed. Flush.
		if _, err := f.w.Write(b); err != nil {
			return 0, err
		}
		return 0, fmt.Errorf("bad exit code: %v (in %q)", err, string(b))
	}
	return code, nil
}

    }

    /**
     * Adds {@code node} if it is not already present.
     *
     * <p><b>Nodes must be unique</b>, just as {@code Map} keys must be. They must also be non-null.
     *
     * @return this {@code Builder} object
     */
    @CanIgnoreReturnValue
    public ImmutableValueGraph.Builder<N, V> addNode(N node) {
      mutableValueGraph.addNode(node);
      return this;
    }

    /**

An optional prefix sets a non-decimal base: <code>0b</code> or <code>0B</code>
for binary, <code>0</code>, <code>0o</code>, or <code>0O</code> for octal,
and <code>0x</code> or <code>0X</code> for hexadecimal
[<a href="#Go_1.13">Go 1.13</a>].
A single <code>0</code> is considered a decimal zero.
In hexadecimal literals, letters <code>a</code> through <code>f</code>
and <code>A</code> through <code>F</code> represent values 10 through 15.
</p>

  public static final String DATE = "Date";

  /** The HTTP {@code Pragma} header field name. */
  public static final String PRAGMA = "Pragma";

  /** The HTTP {@code Via} header field name. */
  public static final String VIA = "Via";

  /** The HTTP {@code Warning} header field name. */
  public static final String WARNING = "Warning";

  // HTTP Request header fields

   * Returns all nodes in this graph adjacent to {@code node} which can be reached by traversing
   * {@code node}'s outgoing edges in the direction (if any) of the edge.
   *
   * <p>This is <i>not</i> the same as "all nodes reachable from {@code node} by following outgoing
   * edges". For that functionality, see {@link Graphs#reachableNodes(Graph, Object)}.
   *
   * <p>Some algorithms that operate on a {@code SuccessorsFunction} may produce undesired results

     * <p>
     * Examples of locations:
     * <ul>
     *   <li>Absolute file path: {@code /path/to/pom.xml}</li>
     *   <li>Relative file path: {@code ../parent/pom.xml}</li>
     *   <li>URL: {@code https://repo.maven.org/.../pom.xml}</li>
     *   <li>Description: {@code <memory>} or {@code <database>}</li>
     * </ul>
     *
     * @return a non-null string describing the source location
     */