Validating a Schematron Schema
Because the MSXML parser does not support Schematron Schemas you need to use another XML validator, for example Jing, Libxml2 or MSV. To validate a Schematron Schema:
Open your Schematron Schema in the XML Editor.
Click Tools > Jing or Tools > Libxml2 or Tools > MSV.
The Output Window is automatically displayed to show any errors in the Schematron Schema.