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Epischema Article on XML.com

Adding a second Relax NG schema in the way you'd add a Schematron schema is an (in my view) nice approach to constraining a base schema.
It is orthogonal like Schematron: You don't need to know or modify the building blocks that the base schema provides.
Unlike Schematron rules, the additional Relax NG schema may be used by XML editors for content completion.
Those of you who listened to this year's XML Prague presentation [1,2] about adding a Docbook-like grammar to TEI divs already know the concept. In a recent article on XML.com [3], I've applied this approach to HTML, using the HTML-first publishing workflow that Dave Cramer described [4] as an example.
I've called this approach, that to my surprise (and admittedly modest knowledge) was hitherto unheard of, "epischema" (epi = on top of).
Please note that I'm not advocating against the use of Schematron; on the contrary. It's just that there's an alternative way to express a certain class of constraints (grammatical ones), and this alternative provides specific, context-dependent content completion suggestions as a side effect.
Looking forward to receiving your comments.


[1] http://archive.xmlprague.cz/2017/files/presentations/epischema/index.html
[2] https://youtu.be/BOHtdnQEokQ?list=PLQpqh98e9RgUcEmbXmI6RolisQaIRw9dm
[3] https://www.xml.com/articles/2017/04/29/epischemas/
[4] https://www.xml.com/articles/2017/02/20/beyond-xml-making-books-html/

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