[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: RE: Concerned about the increasing reliance on XPath
At 2011-05-09 17:50 -0400, Liam R E Quin wrote: >In most cases there's not much point carrying around precomputed values >- see Third Normal Form for relational databases for why duplicated >information is usually a warning flag. But computing it on the fly, >processing the augmented document, and then checking the constraints >still hold, that's another matter. It is an explicit rule in UBL that *all* computed values are expressed in the XML with their final calculated value. A recipient cannot be expected to do any calculation and can only be expected to use the evident values found in the UBL document. Another benefit is that this makes stylesheet writing very generic as the stylesheet knows exactly where the information is in the source XML and where it belongs in the result rendering but doesn't have to know how the values are calculated. >I would almost certainly expect to have the logic _outside_ the document >in most cases Exactly ... we've called that "the calculation model". A community of users needs to agree on that community's calculation model for element values found in a UBL document. Knowing the calculation model is good for a recipients validation of the values. Different communities will have different calculation models for any given value in UBL. It is not up to the standards committee to tell users how they have to calculate any particular value. Just think how complex tax rules are in different communities, for example. But if you don't know the calculation model, you have the numbers to work with. . . . . . . . . . . Ken -- Contact us for world-wide XML consulting & instructor-led training Crane Softwrights Ltd. http://www.CraneSoftwrights.com/x/ G. Ken Holman mailto:gkholman@CraneSoftwrights.com Legal business disclaimers: http://www.CraneSoftwrights.com/legal
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