Intersytems documentation says not to hold entire SDA as object in In-memory.
// Serialize Object to XML
Set object = ##class(User.NewClass1).%New()
s object.Property1="one"
s object.Property2="two"
s object.Property3="three"
s object.Property4="four"
Set w=##class(%XML.Writer).%New()
set w.Charset="UTF-8"
Set w.Indent=1
set status=w.OutputToString()
set status=w.StartDocument()
Set status=w.

