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based on an earlier version of the Wolfram Language.
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ExpressionToSymbolicExpressionML

ExpressionToSymbolicExpressionML[expr]
converts expr to ExpressionML and returns the corresponding SymbolicXML.
  • To use ExpressionToSymbolicExpressionML, you first need to load the XML Package using Needs["XML`"].
  • The following options can be given:
"Annotations"{"XMLDeclaration","DOCTYPEDeclaration","DocumentHeader"}annotations to add to the output (acceptable values are combinations of "DocumentHeader", "XMLDeclaration", and "DOCTYPEDeclaration")