#include <string>
 
struct XmlType {};
 
XmlType XmlType_(const XmlType&, const std::string&) { return XmlType{}; }
std::string XmlType_(const XmlType&) { return ""; }
 
template<typename T>
using TFunc1 = T (*)(const T&, const std::string&);
template<typename T>
using TFunc2 = std::string (*)(const T&);
 
template<typename T, TFunc1<T> func1 = XmlType_, TFunc2<T> func2 = XmlType_>
struct XmlUtil {};
 
int main()
{
    XmlUtil<XmlType> util; 
}

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