* which to start, and using expressions split at the dot ('.') to navigate
     * the object graph beneath this root.
     * @param root the root of the graph.
     */
    public ObjectBasedValueSource(Object root) {
        super(true);
        this.root = root;
    }

    /**
     * <p>Split the expression into parts, tokenized on the dot ('.') character. Then,

     */
    default void attachArtifact(@Nonnull Session session, @Nonnull Project project, @Nonnull Path path) {
        String name = path.getFileName().toString();
        int dot = name.lastIndexOf('.');
        String ext = dot >= 1 ? name.substring(dot + 1) : "";
        ProducedArtifact artifact = session.createProducedArtifact(
                project.getGroupId(), project.getArtifactId(), project.getVersion(), ext);

<img src="/img/tutorial/extending-openapi/image03.png">

## Change the Theme

The same way you could set the syntax highlighting theme with the key `"syntaxHighlight.theme"` (notice that it has a dot in the middle):

{* ../../docs_src/configure_swagger_ui/tutorial002.py hl[3] *}

That configuration would change the syntax highlighting color theme:

<img src="/img/tutorial/extending-openapi/image04.png">

    # Exclude some linters from running on test files.
    - path: _test\.go$|^tests/|^samples/
      linters:
        - errcheck
        - maligned
    - path: _test\.go$
      text: "dot-imports: should not use dot imports"
    # We need to use the deprecated module since the jsonpb replacement is not backwards compatible.
    - linters:
        - staticcheck
      text: "SA1019: package github.com/golang/protobuf/jsonpb"

      ImmutableSet.of(
          "com",
          "co.uk",
          "foo.bd",
          "xxxxxx.bd",
          "org.mK",
          "us",
          "co.uk.", // Trailing dot
          "co\uFF61uk", // Alternate dot character
          "\u7f51\u7edc.Cn", // "网络.Cn"
          "j\u00f8rpeland.no", // "jorpeland.no" (first o slashed)
          "xn--jrpeland-54a.no"); // IDNA (punycode) encoding of above

     * A meta-version is a version suffixed with the {@code SNAPSHOT} keyword.
     */
    @Nonnull
    VersionConstraint getVersionConstraint();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is not included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}
     */
    @Nonnull
    String getExtension();

    /**

    }

    private ReflectionValueExtractor() {}

    /**
     * <p>The implementation supports indexed, nested and mapped properties.</p>
     * <ul>
     * <li>nested properties should be defined by a dot, i.e. "user.address.street"</li>
     * <li>indexed properties (java.util.List or array instance) should be contains <code>(\\w+)\\[(\\d+)\\]</code>
     * pattern, i.e. "user.addresses[1].street"</li>

            "scenario",
            "",
            display = ParameterDisplay.PROMPT,
            allowEmpty = false,
            description = "Which performance test to run. Should be the fully qualified class name dot (unrolled) method name. E.g. org.gradle.performance.regression.java.JavaUpToDatePerformanceTest.up-to-date assemble (parallel true)"
        )

     * @see ArtifactCoordinates#getClassifier()
     */
    @Nonnull
    String getClassifier();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is not included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}
     * @see ArtifactCoordinates#getExtension()
     */
    @Nonnull

{!../../docs_src/bigger_applications/app/routers/items.py!}
```

#### How relative imports work

/// tip

If you know perfectly how imports work, continue to the next section below.

///

A single dot `.`, like in:

```Python
from .dependencies import get_token_header
```

would mean: