XML Prague 2019 Schematron Preconf Session

XProc 3.0: All validation steps will get a report output port
In 1.0, the RNG/RNC and XSD validation steps did not have a report port yet. (You needed to catch the error output, which then consisted of a c:errors document with c:error elements.)
Matthieu Ricaud-Dussarget proposed a unified report format that we slightly modified (and are still modifying).
The error report format can be specified by the pipeline author as a parameter. So for Schematron, it will be possible to receive either SVRL or XVRL (or maybe both; multiple report docs are already permitted for p:validate-with-schematron)
There will be XSLT (probably in this repo) to create XVRL from SVRL
JSON validation should be supported
Multiple error locator syntaxes (all SVRL XPaths, maybe JSON Pointer or JSON Path for JSON)
There should be an alternative JSON serialization for XVRL
Other features:
- fixed severity vocabulary (info, warning, error, fatal-error)
- Flexible error categorizations
- Simple templating mechanism for later binding of computed values that are the same for each localization
More requirements listed in the README

A preliminary RNC schema
A sample report
XML Calabash 2.0 already creates XVRL reports (according to a previous version of the schema)

Is the namespace http://www.xproc.org/ns/xvrl ok? It is not intended as an XProc-only format after all.

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