constraints - odd question
Suppose I want to create a preferences or properties file where the names of the elements correspond to the names of the properties involved. I'm not concerned with validation in the sense that certain elements (it's all elements) must be present in a certain order, but there may be a different kind of validation needed. I want to make certain that no elements have the same names as their siblings. Duplication of a property name will lead to overwriting, and they want a simple way to warn readers that the duplication has occurred before loading the properties file into their particular environment. This isn't hard to do in Java, but Java isn't a natural or easy answer for widespread distribution to newbies. I'm looking for something more like a DTD - an XSLT style sheet might be acceptable. Any thoughts? Attributes come by this property somewhat naturally, but this case is about nested structures. (The question is part my curiosity, part my interpretation of an occasionally recurring reader question.)
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