---
title: NWProtocolFramer.Definition
framework: network
role: symbol
role_heading: Class
path: network/nwprotocolframer/definition
---

# NWProtocolFramer.Definition

A custom protocol definition you use to associate messages with protocol options.

## Declaration

```swift
class Definition
```

## Topics

### Defining Framer Protocols

- [init(implementation:)](network/nwprotocolframer/definition/init(implementation:).md)

## Relationships

### Inherits From

- [NWProtocolDefinition](network/nwprotocoldefinition.md)

### Conforms To

- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Using Framers with Connections

- [NWProtocolFramer.Options](network/nwprotocolframer/options.md)
- [NWProtocolFramer.Message](network/nwprotocolframer/message.md)