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On 13/03/2022 18:21, David Carlisle wrote: [...] "Why" questions are hard to answer, especially when there are people watching who were there and could answer :-) Not guilty :-) But I think that the idea was that processors are allowed to notOddly, in SGML, I think you can actually have your concrete syntax declarations at the start, in the file, before the internal subset. So I'm not really clear why the internal subset would need restricting, but possibly the circuitousness of implementing PEs in the internal subset was one straw too many. Moot in XML anyway. Peter
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