message

type Block struct {
	Label   string
	Content string
	Fields  map[string][]string
	Blocks  []SubBlock
}

type Config struct {
	StopOnError bool
}

type Error struct {
	Line int
	Err  error
}

type Message struct {
	Line        int
	Raw         string
	BasicHeader Block
	AppHeader   Block
	UsrHeader   Block
	Body        map[string][]string
	Trailers    Block
}

type SubBlock struct {
	Label   string
	Content string
}