Pity that's not XML, though.
It was in XML1.0 and is still widely used. I agree that XML Schema is the current way, but it is very, although more flexible and powerful. It can be used for the same things, though.
There goes scriptability and so many of the lovely Unix administration tools we've grown to love over the past few decades.
I'm not sure why. If we want the validation of, say, a DTD, then we need a (possibly) new tool for that. What validates crontab, for example? When I build a major app, I often build validation tools for the config files. I find it easier to use XML and a DTD than going through the difficulty of writing my own parsing and validating code.
Yes, I do understand and agree that the application needs to validate all input. I just like the idea of an external tool to do the first pass.
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Your "XML" examples weren't even well-formed! That ought to lend no little credence to my claim that XML is not easy for humans to write.
What validates crontab, for example?
That would be crontab. If you were writing that program, you'd have to create code to process the arguments somehow anyway.
I agree that an XML processor can check the well-formedness of a document, but I have severe doubts that it can check the semantics of the entire document for anything but trivial configurations, where each option is completely independent and, likely, idempotent.
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