Check out this post from ‘The Wayward WebLog’… it is a good discussion starter for anyone who wants to chat about ORM (object-relational mapping) …

ObjectSpaces: The Devil is in the Demand _I’ve coined the phrase ‘object span’ to describe the ability to front load a graph-based query with enough information to cherry pick at the best bits of data so data retrieval is optimized to the application. I’ve even written about that _ [ _here_ ](http://blogs.msdn.com/mattwar/archive/2004/03/15/90275.aspx) _. Yet I’ve never felt one hundred percent right about any of it. Not the span exactly, but the whole concept of systems designed to retrieve segments of a data graph into the client space, with interceptors (or swizzlers) that fault in more segments upon demand. I’ve come to the conclusion that demand loading is just a terribly bad idea._