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Scala 3/Reference/Dropped Features/Dropped: XML Literals
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Dropped: XML Literals

XML Literals are still supported, but will be dropped in the near future, to be replaced with XML string interpolation:

import dotty.xml.interpolator.*

case class Person(name: String) { override def toString = name }

@main def test: Unit =
 val bill = Person("Bill")
 val john = Person("John")
 val mike = Person("Mike")
 val todoList = List(
 (bill, john, "Meeting", "Room 203, 11:00am"),
 (john, mike, "Holiday", "March 22-24")
 )
 // XML literals (to be dropped)
 val mails1 = for (from, to, heading, body) <- todoList yield
 <message>
 <from>{from}</from><to>{to}</to>
 <heading>{heading}</heading><body>{body}</body>
 </message>
 println(mails1)
 // XML string interpolation
 val mails2 = for (from, to, heading, body) <- todoList yield xml"""
 <message>
 <from>${from}</from><to>${to}</to>
 <heading>${heading}</heading><body>${body}</body>
 </message>"""
 println(mails2)

For more information, see the semester project XML String Interpolator for Dotty by Yassin Kammoun (2019).

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