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Schematron Features

• Can be loose or strict, partial or comprehensive (most flexible)
• Write your own error and warning messages
• A scalable alternative to crafting your own XSLT queries for validation
• XPath fairly expressive for defining constraints
  • looser than top-down schema languages
  • can get creative (e.g. co-occurrence constraints)

(Warning: requires firm grasp of XPath to use properly)