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   Non-deterministic content models

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In Appendix E, the holy script says:

[...] it is required that content models in element type declarations be
deterministic. This requirement is for compatibility with SGML (which calls
deterministic content models "unambiguous"); [...]

This wording makes me wonder if there is any case where a non-deterministic
content model would acctually be useful? That is, is the restriction a
compromise, or can a non-deterministic content model always be simplified
(like many algebraic expressions) to something shorter with the same meaning?



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