This was not the only database conversion that has taken place. In 1990 Ingres was upgraded from version 5 to 6 which required the database to be recreated and consequently re-loaded. Similarly, in the process of producing volume 2 minor modifications have been made to the structure of the database to improve the organisation of the data and the speed of retrieval.
These conventions were devised for the original IDMS/Lasercomposer system. Although it would be possible to introduce newer, more up-to-date codes, for the sake of consistency, and the limitations of time for converting existing data, this possibility is precluded.
In the end it was decided to abandon establishing links between people and just place the information in the relationship comment table relcomm. The reasons for this are described in footnote 6.
Some references could have more than one pattern, and within a pattern a certain amount of variation has to be allowed for.
namid, islid, towid, towdeme, polis, resrely, permindate, permaxdate, bknum, refchap, reftext, refline, perhomon.The reference data only includes the primary reference, while the homonym data only takes effect if all the other values are the same. If there is no homonym value, the order will be as loaded from the original data files.
The place order puts all definite places before queried ones, and attested come at the end of the list. In volume 2, if the initial letter of fragmentary demes was known they were placed in their correctly sorted order, otherwise they came after known demes but before tribes.
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