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Is it a goal to create one authoritative document that can declare the conditions and constraints for all elections it governs, or to create a document from which the conditions and constraints for any given election locale to declare a governing document? It seems to me that trying to keep all conditions and constraints for all election locales in one document will become quite cumbersome. Local rules should be declared and owned locally. I take it that is the reason for the include file. This approach seems preferable to XSLT because it is more transparent although I suspect XSLT will be more powerful for more situations. A social key for acceptance of these devices will be their ready understandability to some informed percentage of the electorate (no technology is truly transparent and as with any issue depends on some percentage to grasp it and explain it to the rest clearly enough that it is accepted). One prefers the easier to explain solution. len -----Original Message----- From: John Cowan [mailto:jcowan@r...] Paul Spencer scripsit: > [...] XML Schema cannot express the constraints required, for example, > a section of a message that is required if the value of a previous > element is "yes", but not if it is "no". RELAX NG can handle this very neatly: <snip/> include "person.rnc" { locale = "US" <snip/> include "ballot.rnc" { affiliation = element affiliation { "Republican" | "Democrat" | "Green" } }
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