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// Package twiml provides a type-safe way of building and parsing the TwiML markup language in Go.
//
// TwiML is an XML-based language used by Twilio to control phone calls and SMS messages. The package provides
// Go structs that can be used to generate TwiML documents or parse incoming TwiML messages.
//
// The `Response` struct is the root element of a TwiML document. It can contain a sequence of `Verb`s, such as
// `Say`, `Gather`, `Pause`, `Redirect`, or `Hangup`. Each `Verb` is represented by a Go struct that contains
// the corresponding TwiML attributes and child elements.
//
// Example usage:
//
// r := &twiml.Response{
// Verbs: []twiml.Verb{
// &twiml.Say{
// Content: "Hello, world!",
// },
// &twiml.Gather{
// Action: "/process_gather",
// NumDigitsCount: 1,
// Verbs: []twiml.GatherVerb{
// &twiml.Say{
// Content: "Press 1 to confirm, or any other key to try again.",
// },
// },
// },
// },
// }
// b, _ := xml.MarshalIndent(r, "", " ")
// fmt.Println(string(b))
//
// Output:
//
// <Response>
//
// <Say>Hello, world!</Say>
// <Gather action="/process_gather">
// <Say>Press 1 to confirm, or any other key to try again.</Say>
// </Gather>
//
// </Response>
//
// Incoming TwiML messages can be parsed using the `Interpreter` struct, which reads a sequence of bytes and
// returns the next `Verb` in the message until the end is reached. The `Interpreter` can be used to implement
// server-side TwiML applications that respond to user input.
package twiml
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