参考資料
1. ISO/WD 10303-226
Industrial automation systems and integration-Product data representation and exchange-
Part 226：Application Protocol：Ship Mechanical Systems (WD：N938)
2. AP226 Material Class and Property Dictionary (CTC)
3. MERCI：Integration of Express based and XML based Component information representation (Wolfgang Wilkes)
4. XML based product model server (VTT：Tero Hemio)
5. Express-X manual (EPM Technology A.S)
