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//! # DDEX Message Types
//!
//! This module contains implementations for various DDEX message types
//! used in music distribution workflows. The DDEX standard defines several
//! message types for different scenarios in the music supply chain.
//!
//! ## Message Types
//!
//! - **NewReleaseMessage (ERN)**: The primary message type for delivering
//! new releases to music platforms and distributors
//! - **UpdateReleaseMessage**: Used to update existing releases with new
//! metadata, resources, or deal information
//! - **PurgeReleaseMessage**: For removing releases from distribution
//!
//! ## Architecture
//!
//! ```text
//! Message Types
//! ├── NewReleaseMessage # Primary release delivery
//! │ ├── MessageHeader # Routing and control info
//! │ ├── ResourceList # Audio/video resources
//! │ ├── ReleaseList # Release metadata
//! │ └── DealList # Distribution terms
//! └── UpdateReleaseMessage # Release updates
//! ├── MessageHeader # Update control info
//! ├── UpdateList # What to update
//! └── Instructions # How to apply updates
//! ```
//!
//! ## Usage Example
//!
//! ```rust
//! use ddex_builder::messages::*;
//! use ddex_builder::{Builder, BuildRequest};
//!
//! // Create a new release message
//! let mut builder = Builder::new();
//! let request = BuildRequest {
//! message_type: MessageType::NewRelease,
//! // ... other fields
//! };
//!
//! let result = builder.build_internal(&request)?;
//! ```
//!
//! ## Message Validation
//!
//! All message types include:
//! - Schema validation against DDEX XSD
//! - Business rule validation
//! - Territory and rights validation
//! - Resource reference integrity checks
pub use *;