Re: URL domain (too much SODA)

> The "reference" prohibition is to other entities within the database,
> by reference (ie, physical or logical address) rather than by value.

A most interesting point. A closely related point, in my mind, is whether the primary key of a table is or is not merely a stand-in for the address of the row. After all, an index is going to map the primary key into an address, somewhere deep in the database engine. So why isn't the primary key merely a kind of "logical address"? But I don't think so. I think a reference by foreign key is a reference by value, even if it's a somewhat artificial value (as in surrogate keys), and even if retrieval ultimately requires an address.

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Regards,
    David Cressey
    www.dcressey.com