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[Schematron] Question about let-Element and multiply defined variables

  • From: David Maus <lists@dmaus.name>
  • To: XML Developers List <xml-dev@lists.xml.org>
  • Date: Mon, 26 Nov 2018 13:22:43 +0100

[Schematron] Question about let-Element and multiply defined variables
Hi all,

Section 5.4.5 of Schematron 2016 reads:

| 5.4.5 let element
| ...
| It is an error to reference a variable that has not been defined in
| the current schema, phase, pattern, or rule, if the query language
| binding allows this to be determined reliably. It is an error for a
| variable to be multiply defined in the current schema, phase, pattern
| and rule.

I understand the last sentence "multply defined in the current schema,
phase, pattern and rule" to mean that I can define a variable in the
schema and then `redefine' the variable in a rule.

I.e. the following Schematron is *not* an error:

<schema xmlns="http://purl.oclc.org/dsdl/schematron">
  <let name="foo" value="'bar'"/
    <rule context="/">
      <let name="foo" value="'baz'"/>

Is this the right interpretation?

  -- David

David Maus M.A.

Www: http://dmaus.name
Twitter: @_dmaus

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