## RFC3339

[https://datatracker.ietf.org/doc/html/rfc3339](https://datatracker.ietf.org/doc/html/rfc3339)

## UUID

```typescript
type UUID = `${number}-${number}-${number}-${number}-${number}`;
```

## URI

```typescript
type URI = string;
```

## Extensions

```typescript
type OrgNamespace = string;
type ExtensionName = string;

type ExtensionsKey = `${OrgNamespace}:${ExtensionName}`;

type Extensions = {
    [key in ExtensionsKey]: any;
}
```