public ImmutableVariableStorage Analyze(XmlNode node, ImmutableVariableStorage knownTaint)
{
Preconditions.NotNull(knownTaint, "knownTaint");
_variableStorage = knownTaint.ToMutable();
_varResolver = new VariableResolver(_variableStorage, _analysisScope);
Analyze(node);
return ImmutableVariableStorage.CreateFromMutable(_variableStorage);
}