Who uses Schematron?

Schematron is an ISO standard which has uptake in many industries, notably the financial, insurance, governmental record exchange, police, and technical and reference publishing sectors. Some examples:

Public

Government and International Agencies

German XRechnung (financial data exchange with public entities)
US National Emergency Management System (NEMSYS)
NASA Planetary Data System
Schematron Files US Department of Defense Data Services Environment.
National Environmental Information Exchange Network (PDF) US
CITES Electronic Permitting Toolkit (PDF) Convention on International Trade in Endangered Species of Wild Fauna and Flora

Water Data Transport Format (PDF) Australian Bureau of Meteorology
Standard Business Reporting Program forms validation Australian Taxation Office. See also PAYG forms validator
Japanese Local Government Periodic Reports (PDF) by Murata Makoto (conference paper)
Open Vulnerability and Assessment Language (OVAL) US Dept Homeland Security

Euro

Government and International Agencies (Europe)

PEPPOL Pan-European Public Procurement Online
European Commission e-trustex secure document transfer platform
HM Revenue and Customs (PDF) UK
Aeronautical Information Exchange Rule Checker EUROCONTROL
Large scale validation of millions of UBL Invoices with XML Schema and Schematron (PDF) Danish Agency for Governmental Management/Danish Ministry of Finance/KPMG

UBL Northern European Subset Universal Business Language
Benchmarking Norwegian Municipal Websites (PDF) (conference paper)
Statistical data confidentiality (PDF) Joint UNECE/Eurostat work session (paper)
SeaDataNet The EU Pan-European Infrastructure for Ocean and Marine Data Management use Schematron to “quality control the maintenance metadata validation” in particular for “field content verification.
Chemical test templates OECD Environment Directorate

Industry

Industry and Consortia

Rules

Naming and Design Rules

NIEM Naming and Design Rules checking US National Information Exchange Model Tools
CDA guideline validation for HL7 NIST (Health)
UBL Code list validation methodology by Ken Holman
ANZLIC Profile Validation Australian Govt Office of Spatial Data Management
Naming and Design Rules Toolkit (PDF) NIST