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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: maps
 >>I can create a type with a regular expression constraining its lexical appearance, but there's no value space, so I can't compare, for instance, 75°15'00" N with 75.2500° N.<< I remember that at CR the need for expanding value space was brought up. Back then in my mind it was for dealing with simpler single units (like the sorting of data based on enumeration values, for instance). It seems like Regular fragmentations is the answer-- or at least in some ways-- you could join "patterned" types that have lexical information using unions but still cannot order the sub-pieces. Maybe this is a good thing to bring up for XML Schema 1.1. >>Once I create those smaller pieces, I can write local logic which handles the particular semantics I need, and I can even share that logic through the magic of open source.<< Based on what you say, it would be interesting if each of the pieces could contain an "order" attribute that described how they should be ordered. But with the unit problem you still come down to the fact that it may be ordered differently when the units are compared. >>Once I've started doing that, it's not very difficult to look back at WXS Part 2 as a misguided effort by programmers and database vendors to give the world the types they use and no others. Dates, times, and numbers are all amenable to processing like the kind I've described above for lat/long, and there's no need to bind everyone to an identical set of vaguely primitive types.<< I think that there are root types somewhere in there... I don't know how you would express it without a notion for numeric values though. This sounds like a double edged complaint-- "They didn't give me enough" "They gave me too much". If they had given all of the types possible it would have just been more fuel for the fire. Maybe my response can be boiled down to this-- it would be good to see a way to control value-space and lexical-space at the same time. I think this would provide us with much richer types-- I am just unsure what it would look like. Best Regards, Jeff Rafter Defined Systems http://www.defined.net XML Development and Developer Web Hosting 
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