BS ISO/IEC 19757-9:2009 Information technology - Document schema definition languages (DSDL) - Namespace and datatype declaration in document type definitions (DTDs)
2009BS ISO/IEC 19757-9:2009 Information technology - Document schema definition languages (DSDL) - Namespace and datatype declaration in document type definitions (DTDs)
2009BS ISO/IEC 19757-9:2008 Information technology. Document schema definition languages (DSDL). Namespace and datatype declaration in document type definitions (DTDs)