Variable/expression interpolation in XML should try to call toXml before resorting to toString

[scabug]

Similiar to String interpolation using toString, variable/expression interpolation inside XML should call something like "toXml" (if it exists) before resorting to toString.

Example:

class Person(name: String, age: Int){
  def toXml = <person><name>{name}</name><age>{age}</age></person>
}

val jon = new Person("Jon Doe", 42)
jon: Person = Person@7e820d53

val jane = new Person("Jane Doe", 40)
jane: Person = Person@3c250cce

val xml = <persons>{jon :: jane :: Nil}</persons>
xml: scala.xml.Elem = <persons>Person@7e820d53 Person@3c250cce</persons> // Current situation

xml: scala.xml.Elem = <persons><person><name>Jon Doe</name><age>42</age></person><person><name>Jane Doe</name><age>40</age></person></persons> // Suggested behaviour

This is a suggestion, no bug report.

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-3730?orig=1
Reporter: @soc

[scabug]

@harrah said:
#3573

[scabug]

@soc said:
Having thought a long time about it, I think this is considerably different to #3573. This one has its own merits and hasn't anything to to with implicits.

[scabug]

@magarciaEPFL said:
Now that we're talking about improving XML support, I wonder what's the status of this feature in the anti-xml library,

http://github.com/djspiewak/anti-xml

I guess it's useful to look at how it's done there before deciding on this enhancement request.

[scabug]

@soc said:
I agree. I'll try to contact Daniel about it and ask him what he thinks about it.

[SethTisue]

embedded XML is a dead/unmaintained feature