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Re: Need a language whiz: An XML Schema "specifies" howdata is

  • From: Tony Graham <tgraham@antenna.co.jp>
  • To: xml-dev@lists.xml.org
  • Date: Mon, 8 Jan 2018 07:43:33 +0000

Re:  Need a language whiz: An XML Schema "specifies" howdata is
On 07/01/2018 22:17, Andrew Sales wrote:
It's a reality which (again) the publishing sector has been living
with since ever publishers started using markup.

They acknowledge or cope with it to a greater or lesser degree: the old-style trope was to have an "authoring DTD" and a "publishing
DTD", the latter more finely attuned to publication needs.

Nowadays, things like Schematron's phases also address this need
quite elegantly.
There is also Gerrit Imsieke's 'Epischema' idea.  From his talk at XML
Prague 2017 [1]:

  Instead of altering the base schema or adding Schematron constraints,
  a second grammar-implementing schema is associated with the document.
  This second schema will enforce structural constraints where the basic
  schema is liberal. This second schema is lightweight in that it allows
  anything anywhere except for a certain aspect for which it adds
  grammatical constraints over the permissive base schema.


Tony Graham.
Senior Architect
XML Division
Antenna House, Inc.
Skerries, Ireland

[1] http://www.xmlprague.cz/day3-2017/#tei

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