public Target(string id, string type, string source, Selector selector)
{
this.id = id;
this.type = type;
this.source = source;
this.selector = selector;
}
public Target(string type, string source, Selector selector)
{
this.id = Guid.NewGuid().ToString();
this.type = type;
this.source = source;
this.selector = selector;
}