Sunday, April 25, 2004 16:33 CDT Hi, Matthew, I finally checked out the thesaurus and authorities management to see if I could find an answer for your first two questions (I've omitted no. 3 as I did not understand what you meant and it was, as you said, off topic).

This probably immmediately marks me as a non-librarian (which is true) although I do understand the concept.

With several years of cataloguing studies and work under my belt, I couldn't figure it either, so don't feel badly as being marked as a non-librarian. I played with the online version for a bit and couldn't get anything familiar to come out of it.

Unfortunately none of the sample data packages seem to have anything entered here so I haven't been able to do by example. I wonder if someone would be kind enough to give a few examples of values that would logically fit together in a thesaurus (and perhaps definitions of "DIG" "RELATED" "FREE FORM" "AUTHORITY" "LIB" and "OTHER LIB"). ...

# From what we can see there, I would assume that DIG would refer to what are properly called SUBJECT SUBDIVISIONS. If one looks at the Library of Congress Subject Headings (LCSH) volumes and many, many other thesauri, one sees major topical headings (subject headings, hereafter, SH) under which various authorised subdivisions (subd's) are listed, often in a format similar to this (at least in print). Ex. SH Physics -- History (an authorised subd) Electronically one would usually find something like this: Ex. Physics Physics--History RELATED could give us See Also (SA) or Related Terms (RTs) so that a patron would be able to examine other areas related to a subject search (or at least have some related areas identified as existing). I don't know what happened to Broader Topic/Term (BT) or Narrower Topic/Term (NT), which should be kept distinct in proper authority control. There should also be markers for USE and UF (Use For), which help identify what form a patron should use. FREE FORM: I am worried about this usage. In using LCSH etc., there are free-floating subd's, ones that can go with (almost) any heading. There are also Pattern Headings (e.g. Fishes in LCSH tells us what subd's are authorised for ALL Animals) and Form Subdivisions (which identify specific types of textual materials). Finally, there is the general authority to create specific personal, geographic and topical SH as needed. Since FREE FORM might refer to any of these, we definitely need more clarity here. I thought perhaps AUTHORITY is meant to identify which system (LCSH, Sears, etc.) but I couldn't guess about LIB or OTHER LIB.

... Obviously a pointer to a web resource on these would be wonderful, but I am thinking specifically in terms of what they refer to in Koha.

We'll have to wait on more knowledgeable cataloguers or Koha developpers/users to do that and to clarify what is going on with the Koha authority/thesaurus terms.

2 : Also: I assume the thesaurus values have an effect on the SUBJECT field: but what exactly?

The thesaurus tells us what terms we can use in a subject field. With some systems, you can only enter terms that are fixed in the thesaurus (authorities) in SH fields, so if you have to add something new, you have to add it to subjects first. Other more complex systems allow you to enter terms in the subject field tag/s and have them appear simultaneously (or at re-indexing anyway) in the thesaurus. Even more complex systems will try to stop you if they detect a form that is similar to what you are trying to enter as a new heading to ensure that you are not making incorrect entries that split the authorities (e.g. creating two different forms of the name for the same person, or accidentally misspelling a word -- both common problems). Authorities/thesauri need maintenance to ensure that the SHs are correct and vice versa because CONSISTENCY is CRITICAL to making sure both staff and patrons can rely on the catalogue. In terms of values, theoretically (although I've yet to find a system that actually does this), the SH tags in MARC allow one to code for which system one is using (second indicator), so one could -- again in theory and apparently not in practice -- use more than one system in parallel at the same time. Since most systems' authorities aren't that well-maintained, it is more pragmatic to make sure whatever SH system you are using is used properly and CONSISTENTLY. I hope some of this helps in the meantime, Matthew. Welcome to the wonderful world of Koha! Looking forward to hearing more from other Koha users and the developpers on this interesting question Matthew has raised. Cheers, Steven F. Baljkas library tech at large Koha neophyte Winnipeg, Manitoba, Canada --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.663 / Virus Database: 426 - Release Date: 20/04/2004