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     interface{}
	ValueType ValueType
}

	default:
		return xml.UnmarshalError(fmt.Sprintf("expected element type <LegalHold>/<ObjectLockLegalHold> but have <%s>",
			start.Name.Local))
	}
	for {
		// Read tokens from the XML document in a stream.
		t, err := d.Token()
		if err != nil {
			if err == io.EOF {
				break
			}
			return err
		}

		if se, ok := t.(xml.StartElement); ok {
			switch se.Name.Local {

# Architecture of Istiod

This document describes the high level architecture of the Istio control plane, Istiod.
Istiod is structured as a modular monolith, housing a wide range of functionality from certificate signing, proxy configuration (XDS), traditional Kubernetes controllers, and more.

## Proxy Configuration

1.7. “Larger Work”

     means a work that combines Covered Software with other material, in a separate
     file or files, that is not Covered Software.

1.8. “License”

     means this document.

1.9. “Licensable”

     means having the right to grant, to the maximum extent possible, whether at the
     time of the initial grant or subsequently, any and all of the rights conveyed by
     this License.

Pydantic을 기반으로 하는, 데이터베이스를 위한 <abbr title="Object-Relational Mapper">ORM</abbr>, <abbr title="Object-Document Mapper">ODM</abbr>을 포함한 외부 라이브러리를 포함합니다.

이는 모든 것이 자동으로 검증되기 때문에, 많은 경우에서 요청을 통해 얻은 동일한 객체를, **직접 데이터베이스로** 넘겨줄 수 있습니다.

반대로도 마찬가지이며, 많은 경우에서 여러분은 **직접 클라이언트로** 그저 객체를 넘겨줄 수 있습니다.

	},
	ErrInvalidPolicyDocument: {
		Code:           "InvalidPolicyDocument",
		Description:    "The content of the form does not meet the conditions specified in the policy document.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrAccessDenied: {
		Code:           "AccessDenied",
		Description:    "Access Denied.",
		HTTPStatusCode: http.StatusForbidden,
	},
	ErrBadDigest: {

* **Convert data**: from the request to the required type.
* **Validate data**: coming from each request:
    * Generating **automatic errors** returned to the client when the data is invalid.
* **Document** the API using OpenAPI:
    * which is then used by the automatic interactive documentation user interfaces.

		},
		bucketTargetConfig:     &madmin.BucketTargets{},
		bucketTargetConfigMeta: make(map[string]string),
	}
}

// Return the last update of this bucket metadata, which
// means, the last update of any policy document.
func (b BucketMetadata) lastUpdate() (t time.Time) {
	if b.PolicyConfigUpdatedAt.After(t) {
		t = b.PolicyConfigUpdatedAt
	}
	if b.ObjectLockConfigUpdatedAt.After(t) {
		t = b.ObjectLockConfigUpdatedAt
	}

<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>

## Update the App with Multiple Models

1.7. “Larger Work”

     means a work that combines Covered Software with other material, in a separate
     file or files, that is not Covered Software.

1.8. “License”

     means this document.

1.9. “Licensable”

     means having the right to grant, to the maximum extent possible, whether at the
     time of the initial grant or subsequently, any and all of the rights conveyed by
     this License.