模式文档和实例文档 schemaxmlns=http://www.w3.org/2001/xmlschema xmlns:po=http://www.examplecom/po1 targetnamespace=http://www.examplecom/pol element FormDe fault= unqualified attributeFormDefault=unqualified"> <element name=comment FOrder" t ype=po: PurchaseOrderType"/> <element. name= purchase <complexType name= PurchaseOrderType> <sequence> <∞1∞ mcnt nan-" ship typo-po: USAddrcsa/> <element ref= po: conment- type- po: USAddress"/> <element name=billTo minOccurs=o/> </sequence> /complexType> <complexType name="USAddress> <sequence> <element name=name type= string/> <element name t工 eet type= strip </sequence> /complexType> <! </schema>模式文档和实例文档