Data Abstraction in F#

Data abstraction deals with the question, how to compose compound data from primitive types. SICP states : Data abstraction is a methodology that enables us to isolate how a compound data object is used from the details of how it is constructed from primitive data object. We will firstly implement a solution which is similar to the SICP text book (http://mitpress.mit.edu/sicp/). It uses tuples as primitive data structure. Indeed, tuples are very straightforward and powerful primitive data structure in functional programming ,but on the other hand, we have to consider, whether these primitives are suitable for .Net platform in the era of SOA or cloud computing.
Please check http://www.paul-abraham.com/FSharpCode2SICP.doc to get the whole series .