## Nested Models { #nested-models }

Each attribute of a Pydantic model has a type.

But that type can itself be another Pydantic model.

So, you can declare deeply nested JSON "objects" with specific attribute names, types and validations.

All that, arbitrarily nested.

### Define a submodel { #define-a-submodel }

For example, we can define an `Image` model:

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

/**
 * Event sent by maven during various phases of the build process.
 * Such events can be listened to using {@link Listener}s objects
 * registered in the {@link Session}.
 *
 * @since 4.0.0
 */
@Experimental
public interface Event {

    /**
     * Gets the type of the event.
     *

			}
		case "Bucket":
			z.Bucket, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "Bucket")
				return
			}
		case "Object":
			z.Object, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "Object")
				return
			}
		default:
			err = dc.Skip()
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}

    }

    @Override
    public void acceptAllColumnMap(Entity entity, Map<String, ? extends Object> allColumnMap) {
    }

    @Override
    public Map<String, Object> extractPrimaryKeyMap(Entity entity) {
        return null;
    }

    @Override
    public Map<String, Object> extractAllColumnMap(Entity entity) {
        return null;

        this.ptype = 0;
        this.flags = DCERPC_FIRST_FRAG | DCERPC_LAST_FRAG;
    }

    /**
     * Returns the DFS root entries retrieved from the enumeration.
     *
     * @return an array of FileEntry objects representing the DFS roots
     */
    public FileEntry[] getEntries() {
        final netdfs.DfsEnumArray200 a200 = (netdfs.DfsEnumArray200) this.info.e;
        final SmbShareInfo[] entries = new SmbShareInfo[a200.count];

    //                                                                              ======
    @Override
    public Map<String, Object> toSource() {
        Map<String, Object> sourceMap = new HashMap<>();
        if (boostExpr != null) {
            addFieldToSource(sourceMap, "boostExpr", boostExpr);
        }
        if (createdBy != null) {

        if (options != null) {
            final Iterator iter = options.keySet().iterator();
            while (iter.hasNext()) {
                final Object key = iter.next();
                final Object val = options.get(key);
                ret.append(",").append(key).append("=").append(val);
            }
        }
        ret.append("]");
        return ret.toString();
    }

        setCreatedAt_GreaterThan(createdAt, null);
    }

    public void setCreatedAt_GreaterThan(LocalDateTime createdAt, ConditionOptionCall<RangeQueryBuilder> opLambda) {
        final Object _value = toRangeLocalDateTimeString(createdAt, "date_optional_time");
        RangeQueryBuilder builder = regRangeQ("createdAt", ConditionKey.CK_GREATER_THAN, _value);
        if (opLambda != null) {

    //                                                                              ======
    @Override
    public Map<String, Object> toSource() {
        Map<String, Object> sourceMap = new HashMap<>();
        if (boost != null) {
            addFieldToSource(sourceMap, "boost", boost);
        }
        if (createdBy != null) {

 * </ul>
 *
 * <h2>Usage Example:</h2>
 * <pre>
 * {@code
 * String escapedXml = XmlUtil.escapeXml("<tag>value</tag>");
 * Map<String, Object> dataMap = XmlUtil.getDataMap(accessResultData);
 * }
 * </pre>
 *
 * <h2>Thread Safety:</h2>
 * <p>
 * This class is thread-safe as it does not maintain any state.
 * </p>
 *
 * <h2>Dependencies:</h2>