getChildMathMLElements(const typename Model::Node& el, std::vector<SmartPtr<MathMLElement> >& content) const
getChildMathMLElements(const typename Model::Element& el, std::vector<SmartPtr<MathMLElement> >& content) const
  getChildMathMLElements(const typename Model::Node& el, std::vector<SmartPtr<MathMLElement> >& content) const  {    content.clear();    for (typename Model::ElementIterator iter(el, MATHML_NS_URI); iter.more(); iter.next())      content.push_back(getMathMLElement(iter.element()));  }