Re: "Introducing MicroXML, Part 1: Explore the basic principle
>So I don't think elements provide what PIs do: if elements were satisfactory, people would use elements. We had an interesting debate during XSD 1.1 development on whether PIs (and comments) should be visible to assertions. On the one hand, people felt there should be a way for the schema to control whether PIs were allowed or not. But other people felt that the whole point of PIs is that enable document authors and recipients to get around restrictions imposed by unimaginative schema designers. The final outcome was: By default, comments and processing instructions are excluded from the partial ·post-schema-validation infoset· [visible to an assertion], but ·at user option· processors may retain comments and processing instructions instead of excluding them. (Saxon supplies such an option.) Michael Kay Saxonica
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