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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 10:14:56 +0000

Re:  Need a language whiz: An XML Schema "specifies" howdata is
On 08/01/2018 09:20, Rick Jelliffe wrote:
I still don't see what the novelty of "epischemas" is supposed to be,
 apart from giving a name (which is welcome).   James Clark did this
 parallel grammar technique for HTML IIRC, as a way to reconstruct
IIRC, Gerrit did refer to James Clark's precedent (and its absence of a
name) in his talk, though I can't find a mention of it in either of
Gerrit's slides or paper.

exclusion exceptions (i.e. that an <a> could not contain an <a> etc)
 without combinatorial explosion.  Schematron supported multiple
patterns in parallel from the start.   DSDL's NVRL was based on
selecting different sections of documents and running them through
different schemas (including in parallel).  Lloyds of London
Financial Markets use of layers of increasing complexity (IIRC a
basic grammar, then a complex grammar, then a Schematron) to weed out
bad transactions efficiently was widely reported.  And the idea of a
Bloom filter is basic CS knowledge.
Everybody here is pro-Schematron, but Gerrit's stated reason for using
multiple schema bundled with NVDL is context-aware content completion in


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

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