using xml** Describes a person, corporation, or similar entity.** ** @see The [Person]`http://tools.ietf.org/html/rfc4287#section-3.2` Constructclass Person {** *(Required)*** A human-readable name for the person. Str name** *(Optional)*** A home page for the person. Uri? uri** *(Optional)*** An email address for the person. Uri? email** Creates a 'Person' with the required fields.new make(Str name){this.name = name}** Creates a Person element with the given element name.virtual XElem toXml(Str elementName){ person := XElem(elementName) person.add(XElem("name"){ XText(this.name),})if(uri != null) person.add(XElem("uri"){ XText(this.uri.toStr),})if(email != null) person.add(XElem("email"){ XText(email.toStr),})return person}}