The sixth normal form is just a name - nothing more.

[vldm10]

The authors of 6NF have not constructed a procedure that will decompose any
relation into corresponding set of binary relations. The binary relations
consists of a simple key and an attribute.

Authors of 6NF, in all examples use only relations that contain a simple key.
The simple key is the simplest form of the key. They do not mention the
complex key, which is the most important case for keys.

Here, I think on the following book: Temporal Data & the Relational Model"
from 2003, by Date, C.J .; Darwen, Hugh; Lorentzos, Nikos. In this book is
presented 6NF.

The reason for this bluffing is that these authors can not solve the history
of events and can not construct atomic structures for corresponding complex
relations. They also can not solve entire parts of database practice(regarding
history and atomic structures).

Vladimir Odrljin

[Erwin]

Post by vldm10
The authors of 6NF have not constructed a procedure that will decompose any
relation into corresponding set of binary relations. The binary relations
consists of a simple key and an attribute.
Authors of 6NF, in all examples use only relations that contain a simple key.
The simple key is the simplest form of the key. They do not mention the
complex key, which is the most important case for keys.
Here, I think on the following book: Temporal Data & the Relational Model"
from 2003, by Date, C.J .; Darwen, Hugh; Lorentzos, Nikos. In this book is
presented 6NF.
The reason for this bluffing is that these authors can not solve the history
of events and can not construct atomic structures for corresponding complex
relations. They also can not solve entire parts of database practice(regarding
history and atomic structures).
Vladimir Odrljin

I picked the book and the second random page I grabbed (184, FWIW) had the following example :

SP_SINCE { s# , p# , SINCE } KEY { s# , p# }
SP_DURING { s# , p# , DURING} KEY { s# , p# , DURING}

You need to improve on your fact-checking.

[vldm10]

I thought that this user group "is dead", so I do not use it everyday and
because of that I did not reply immediately.

In this thread I mentioned the book "The temporal data and The Relational
model" written by Date, Darwen and Lorentzos. In their book, authors use the
database called "The suppliers-and-parts" as "The running example". In this
database, authors use relations Suppliers, Parts and Shipments. In all their
relations, the keys are simple. The simple key is the simplest case.
However the case of 6NF is with the most complex scientific problem - these
are atomic structures. Note that when we have a complex key, that is, a key
composed of n attributes, then the atomic structures are absurd, because
this atomic structure has one attribute and a key that is complex, composed
of n attributes.
Such key causes major problems. For example, it is possible that in this
complex key its attributes change their values - one or more values - one or
more attributes - at one point of time - at different points of time or at
time intervals ...
Note that the relations described by "relationships among entities" can be
constructed of n complex keys whose attributes change values over time.

Atomic structures precisely determine how thoughts are constructed, how
concepts are constructed, and also determines the construction of objects,
predicates, propositions ... These are fundamental questions in several
sciences. I want to say that this is a topic about very important things.

The Sixth Normal Form does not offer any particular procedure or solution,
which allows the "relations" to be brought to the sixth normal form. However
that is the only that matter.
So 6NF is just a name.

Paper „Anchor Modeling“ won the first prize at the well-known World
Congress, whose honorary president is Peter Chan. The authors of "Anchor
modeling" put the "sixth normal form" in the title of their paper.
Authors of "Anchor Modeling" use the so-called "surrogate key" for their
main structure.
Edgar Codd also tried to obtain the atomic structures. He tried to do it
using the "surrogate key".
However, Edgar Codd and the authors of 6NF are bluffing that they have given
the solution to atomic structures. They have not given any concrete and
realistic solution that can really be applied.
The authors of "Anchor Modeling" in their main structure "Anchor" plagued my
solution and idea. However, the authors of "Anchor Modeling" have introduced
some of their own ideas that are irrelevant and of minor significance.
Authors of „Anchor modeling“ are based on Codd's "Atomic Structures" and
"Atomic Structures" from 6NF.

On this user group I have presented examples that show that "Anchor
Modeling" can not solve some important problems. I have also shown that
"Anchor Modeling" can cause chaos in databases. Some of my examples show
that crime can be made in the database using "Anchor Modeling".

Vladimir Odrljin