Citation order

Aida, you provided a great explanation about notation for 
common auxiliaries/facet combination, and you are right
that UDC is a more appropriate system to provide examples
of it.


"b) citation order.... is the rule of order between facets that
enables compound and complex concept building. This is purely
intellectual and arbitrary for each system in-spite strong 
similarities" (Nested facets / Aida Slavic)

Well, I suspect that Ranganathan and CRG people would not 
stay indifferent while hearing about "arbitariness" :-)  Actually 
-- as you know -- they did search good general principles for 
citation order... Ranganathan claimed that the sequence

	personality, matter, energy, space, time

has an order or "decreasing concreteness", though this
can be said to be quite abstract and vague... CRG developed 
on this to define a greater number of fundamental categories 
(broad facets), and I believe they defined it on the basis 
both of practice and of linguistic theory of cases...

As for UDC citation order

	subject, time, place, form, language

I am ignorant, but would like to know more about its origin. 
Of course we have to keep in mind here that UDC was 
originally not faceted, and that the facets you mention are, 
so to speak, more superficial than those in fully faceted 
schemes. 

Generally speaking, my feeling is that citation order is
a key feature of faceted classification which is often
neglected in digital applications. Though it's true that
information retrieval technologies allow people to find 
a facet no matter where it is positioned within a subject 
string (so that we do not need "chain procedure" anymore),
I believe it can still be important in displaying and 
browsing sorted lists of large numbers of items...



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