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I note in passing that relational here should probably be SQL and relations should certainly be relvars, but I don t want to pursue those issues further here Rather, the point is that the systems in question are clearly thinking of the relvars in question as consisting of collections of tuple variables or tuplevars there wouldn t be any point in assigning identifiers to (or, better, associating identifiers with) tuple values! So the systems in question are based on a logically flawed concept; as we know, relvars don t contain tuplevars, they contain relation values, which contain tuple values.

The purpose of side-by-side deployment is to allow application authors to safely deploy and update applications/assemblies while allowing assemblies to be shared safely. Windows XP does this by supporting two key features: side-by-side assemblies and isolated application installation. Support for side-by-side assemblies allows multiple versions of an assembly to be installed and run at the same time. Support for isolated applications ensures that the installation of one application does not affect an application that is already installed. The benefits of side-by-side deployment are as follows: Applications written, and tested, against a specific assembly are executed against the same assembly. You can deploy an application by simply using an xcopy mechanism. Installing an application no longer requires a reboot. Side-by-side deployment relies on components, and applications use metadata to describe themselves rather than the registry (which is what previous versions of Windows recommended). Moreover, shared assemblies go into a well-known folder, %WinDir%\WinSxS, where they are managed by version. Side-by-side deployment exploits the idea of self-containment, as depicted in Figure 6-1.

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And yet that is a common practice with outsourcing. For whatever reason, people simply accept someone with below-average communication skills instead of saying, I m sorry, but we need someone that can speak our language better. We never hesitated when it came to communication skills. If I was not able to understand a candidate during the interview, then my customers would have no chance of understanding them. So we held out for a candidate that could communicate, and emphasized that over technical skills. I felt I could teach anyone the skills they needed, but I could not teach them English. I did not need a senior administrator; I would take a junior administrator that could speak well instead. And in order to handle any turnover, we would always keep a shadow resource on staff so that we could easily transition new members to the team without suffering loss of support.

Even this flaw might not matter, however (I mean, it might not be a concern at the model level), were it not for the following: First, the systems in question typically expose those tuple IDs to the user (indeed, if they don t, then from the user s point of view those tuple IDs don t exist they aren t part of the model, and we don t need to talk about them) Exposing them to the user means the user can access and exploit them in a variety of ways Unless they re represented to the user as just another relational attribute, however (which they might or might not be), we have a violation of The Information Principle on our hands.

Second, so far as I m aware, the systems in question universally associate such IDs with tuples in base relvars only, not with tuples in other kinds of relvar (eg, views), and certainly not with tuples in relations produced as the result of evaluating some general relational expression (eg, the result of some query) Users thus see a logical difference between base relvars and other kinds, and between base relations and other kinds (where by the term base relation I mean a relation that happens to be the value of some base relvar) And so we have a violation of The Principle of Interchangeability on our hands Note: The Principle of Interchangeability (of base and derived relvars) is discussed in depth in my book An Introduction to Database Systems.

Basically what it says is simply that the user shouldn t be able to tell the difference between base relvars and other kinds Following on from the foregoing discussion, I now claim that it was at least partly a confusion over the value vs variable distinction that led to the introduction of object IDs into the object world The Third Manifesto rejects the concept of object IDs, finding them to be both unnecessary and undesirable The argument to show they re unnecessary goes like this: By definition, every value is distinct from every other value (ie, is in fact self-identifying) Values thus have no need to carry around with themselves some hidden, secret identifier that s somehow separate from the value itself, and indeed they don t do so.

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