Representer.representScalar

struct MyStruct
{
    int x, y, z;

    //Any D:YAML type must have a custom opCmp operator.
    //This is used for ordering in mappings.
    const int opCmp(ref const MyStruct s)
    {
        if(x != s.x){return x - s.x;}
        if(y != s.y){return y - s.y;}
        if(z != s.z){return z - s.z;}
        return 0;
    }        
}

Node representMyStruct(ref Node node, Representer representer)
{ 
    auto value = node.as!MyStruct;
    auto scalar = format("%s:%s:%s", value.x, value.y, value.z);
    return representer.representScalar("!mystruct.tag", scalar);
}