@app.post("/items/")
async def create_item(item: Item, project_id: Annotated[int, Query(...)]): ...
```

## Return Type or Response Model

When possible, include a return type. It will be used to validate, filter, document, and serialize the response.

```python
from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None

        private void testSetup(Snippet snippet) {
            if (lastDocsPath == snippet.path) {
                throw new InvalidUserDataException("$snippet: wasn't first. TESTSETUP can only be used in the first snippet of a document.")
            }
            setupCurrent(snippet)
            current.println('---')
            current.println("setup:")
            if (snippet.setup != null) {
                setup(snippet)
            }

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

      "Licensor" shall mean the copyright owner or entity authorized by
      the copyright owner that is granting the License.

      "Legal Entity" shall mean the union of the acting entity and all

                for (final Map<String, Object> document : documentItems) {
                    if (!first1) {
                        buf.append(',');
                    } else {
                        first1 = false;
                    }
                    buf.append('{');
                    boolean first2 = true;
                    for (final Map.Entry<String, Object> entry : document.entrySet()) {

        docs.add(doc2);

        setupMockComponents(docs);

        final String result = indexExportJob.execute();

        assertEquals("Exported 2 documents.", result);

        // Verify first document
        final Path file1 = tempDir.resolve("example.com/page1.html");
        assertTrue(Files.exists(file1));
        final String html1 = Files.readString(file1, StandardCharsets.UTF_8);

    }

    /**
     * Deletes documents from the specified index based on the given query.
     *
     * @param client the OpenSearch client to use for executing the query and delete operations
     * @param settings the settings for the suggest feature, including timeouts and scroll settings
     * @param index the name of the index from which documents should be deleted

            }
        }
        return LaResponseUtil.getResponse().encodeURL(sb.toString());
    }

    /**
     * Encodes a string for similar document hash processing.
     *
     * @param input the string to encode
     * @return encoded string, or the original input if blank
     */
    public static String sdh(final String input) {

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Then go to the `/docs` UI, you will see that **FastAPI** is using these **models** to **document** the API, and it will use them to **serialize** and **validate** the data too.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

import org.apache.maven.api.annotations.ThreadSafe;

/**
 * An immutable XML node representation that provides a clean API for working with XML data structures.
 * This interface represents a single node in an XML document tree, containing information about
 * the node's name, value, attributes, and child nodes.
 *
 * <p>Example usage:</p>
 * <pre>
 * XmlNode node = XmlNode.newBuilder()
 *     .name("configuration")

type ValueType int

// Different types of JSON value
const (
	Unknown ValueType = iota
	Null
	String
	Number
	Boolean
	Array
	Object
)

// MetaValue wraps a decoded interface value with the document
// position and depth at which the value was parsed
type MetaValue struct {
	Offset    int
	Length    int
	Depth     int
	Value     any
	ValueType ValueType
}