},
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "required": False,
                            "schema": IsDict(
                                {
                                    "anyOf": [{"type": "string"}, {"type": "null"}],

                        "content": {
                            "application/x-yaml": {
                                "schema": {
                                    "title": "Item",
                                    "required": ["name", "tags"],
                                    "type": "object",
                                    "properties": {
                                        "name": {"title": "Name", "type": "string"},

                    },
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "required": False,
                            "schema": IsDict(
                                {
                                    "anyOf": [
                                        {"type": "array", "items": {"type": "string"}},

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * @author shinsuke
 * @author Keiichi Watanabe
 */
public class CreateForm {

    @Required
    public String dictId;

    @ValidateTypeFailure
    public Integer crudMode;

    @Required
    @Size(max = 1000)

			features = append(features, f2)
		}
	}

	bw := bufio.NewWriter(os.Stdout)
	defer bw.Flush()

	var required []string
	for _, file := range checkFiles {
		required = append(required, fileFeatures(file, needApproval(file))...)
	}
	for _, file := range nextFiles {
		required = append(required, fileFeatures(file, true)...)
	}
	exception := fileFeatures(filepath.Join(testenv.GOROOT(t), "api/except.txt"), false)

                    "title": "InvoiceEventReceived",
                    "required": ["ok"],
                    "type": "object",
                    "properties": {"ok": {"title": "Ok", "type": "boolean"}},
                },
                "ValidationError": {
                    "title": "ValidationError",
                    "required": ["loc", "msg", "type"],
                    "type": "object",

                    "title": "Item",
                    "required": ["data"],
                    "type": "object",
                    "properties": {"data": {"title": "Data", "type": "string"}},
                    "example": {"data": "Data in schema_extra"},
                },
                "ValidationError": {
                    "title": "ValidationError",
                    "required": ["loc", "msg", "type"],

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * @author codelibs
 * @author Shunji Makino
 * @author Keiichi Watanabe
 */
public class CreateForm {

    @ValidateTypeFailure
    public Integer crudMode;

    @Required
    @Size(max = 100)
    public String name;

                            }
                        },
                        "required": True,
                    },
                }
            }
        },
        "components": {
            "schemas": {
                "ValidationError": {
                    "title": "ValidationError",
                    "required": ["loc", "msg", "type"],
                    "type": "object",

The way to describe this in OpenAPI, is to mark that field as **required**, because it will always be there.

Because of that, the JSON Schema for a model can be different depending on if it's used for **input or output**:

* for **input** the `description` will **not be required**
* for **output** it will be **required** (and possibly `None`, or in JSON terms, `null`)

### Model for Output in Docs