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this post was submitted on 27 Feb 2024
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And what would your ideal, legible, general-purpose data markup language be? XML?
Depends on the use case but XML is good for markup—especially if you need extensibility.
For config, Nickel & Dhall take the cake for being typed & having LSPs so the configuration writer can get immediate feedback about possible options (while eliminating invalid states) without requiring the manual—with configuration readers not needing to mess around with marshaling their types. Both these configuration languages let you import files & write little loops to make your config more DRY & makes maintaining large files (like say Kubernetes) easier.
XML is great if the (de-)serialization is already implemented. Otherwise traversing the document is a massive pain.
True. Something like XPath can really help & there are use cases where that is more concise but requires loading XPath into your head like Regex (which tends to get unloaded). The extensibility shines tho as seen by XMPP continuing to this day with very good backwards compatibility with 2 decades of updates since everything in an extension to the base.