修改PageInfo问题

printer-schema.xsd

@@ -210,7 +210,7 @@
         <xs:element name="printer-config" minOccurs="0" maxOccurs="1">
           <xs:complexType>
             <xs:all>
-              <xs:element name="page-info">
+              <xs:element name="page-info" minOccurs="0">
                 <xs:annotation>
                   <xs:documentation>设置纸张信息</xs:documentation>
                 </xs:annotation>