schematron 0.3.1

Schematron: pure Rust implementation of ISO/IEC 19757-3 rule-based XML validation, with its own XML parser, XPath 1.0 engine, XPath 2.0 subset, schema linting, and SVRL reporting. By SixArm.com.
Documentation 
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<?xml version="1.0" encoding="UTF-8"?>
<invoice>
  <line qty="-2" amount="10.00"/>
  <line type="discount" qty="1" amount="5.00"/>
  <total>99.00</total>
</invoice>