std::map<std::string, std::string>* model_properties, sg_size_t size)
: id(id), model(model), content(content), properties(properties), model_properties(model_properties), size(size)
{
std::map<std::string, std::string>* model_properties, sg_size_t size)
: id(id), model(model), content(content), properties(properties), model_properties(model_properties), size(size)
{