要想让平台的适应面扩大，就要让平台从封闭走向开放——使其能够在各个层次和已获得广泛应用的各类软件进行互联。可以互联的层次有：

逻辑（物理）建模、流程组态、访问控制、界面组态、界面交互、数据读写、消息机制……

    千里之行，始于足下——先从建模开始吧。我发现业界关于元模型信息交换有一个标准（XMI），于是花了大几天的功夫，总算找到了一个可以同时被多个工具正确识别的XMI格式样板:

<?xml version = '1.0' encoding = 'GBK' ?>
<XMI xmi.version = '1.2' xmlns:UML = '//org.omg/UML/1.3'>
 <XMI.header>
  <XMI.documentation>
   <XMI.exporter>
     Together
   </XMI.exporter>
   <XMI.exporterVersion>
     6.1
   </XMI.exporterVersion>
  </XMI.documentation>
  <XMI.metamodel xmi.name = 'UML' xmi.version = '1.4'/>
 </XMI.header>
 <XMI.content>
  <UML:Model xmi.id = 'S.1' name = 'Project' visibility = 'public'>
   <UML:Namespace.ownedElement>
    <UML:Package xmi.id = 'S.3'
          name = 'MyPkg' visibility = 'package' isSpecification = 'false'
          isAbstract = 'false'>
     <UML:Namespace.ownedElement>
      <UML:Class xmi.id = 'S.6'
            name = '车' visibility = 'package' isSpecification = 'false'
            isAbstract = 'false' isActive = 'false'>
       <UML:Classifier.feature>
        <UML:Attribute xmi.id = 'S.7'
              name = '排量' visibility = 'private' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.1'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Operation xmi.id = 'S.8'
              name = '启动' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
        <UML:Operation xmi.id = 'S.9'
              name = '前进' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
        <UML:Operation xmi.id = 'S.10'
              name = '转向' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
          <UML:Parameter xmi.id = 'XX.0' name = 'Angle' isSpecification = 'false' kind = 'inout' type = 'G.1'>
          </UML:Parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
       </UML:Classifier.feature>
       <UML:Namespace.ownedElement>
        <UML:Generalization xmi.id = 'G.2'
              name = '' visibility = 'public' isSpecification = 'false'
              discriminator = ''>
         <UML:Generalization.child>
          <UML:GeneralizableElement xmi.idref = 'S.6'/>
         </UML:Generalization.child>
         <UML:Generalization.parent>
          <UML:GeneralizableElement xmi.idref = 'S.11'/>
         </UML:Generalization.parent>
        </UML:Generalization>
       </UML:Namespace.ownedElement>
      </UML:Class>
      <UML:Class xmi.id = 'S.12'
            name = '厂家' visibility = 'package' isSpecification = 'false'
            isAbstract = 'false' isActive = 'false'>
       <UML:Classifier.feature>
        <UML:Attribute xmi.id = 'S.13'
              name = '名称' visibility = 'public' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.3'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Attribute xmi.id = 'S.14'
              name = '地址' visibility = 'private' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.3'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Attribute xmi.id = 'S.15'
              name = '联系方式' visibility = 'private' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.3'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Attribute xmi.id = 'S.16'
              name = 'ID' visibility = 'private' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.4'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
       </UML:Classifier.feature>
      </UML:Class>
      <UML:Class xmi.id = 'S.11'
            name = '产品' visibility = 'package' isSpecification = 'false'
            isAbstract = 'false' isActive = 'false'>
       <UML:Classifier.feature>
        <UML:Attribute xmi.id = 'S.17'
              name = '生产厂家' visibility = 'public' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.4'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Attribute xmi.id = 'S.18'
              name = '型号' visibility = 'public' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.3'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Attribute xmi.id = 'S.19'
              name = '生产日期' visibility = 'private' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.5'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Attribute xmi.id = 'S.20'
              name = '保修期' visibility = 'private' isSpecification = 'false'
              changeability = 'changeable' ownerScope = 'instance'>
         <UML:StructuralFeature.multiplicity>
          <UML:Multiplicity>
           <UML:Multiplicity.range>
            <UML:MultiplicityRange lower = '1' upper = '1'/>
           </UML:Multiplicity.range>
          </UML:Multiplicity>
         </UML:StructuralFeature.multiplicity>
         <UML:StructuralFeature.type>
          <UML:Classifier>
           <UML:Namespace.ownedElement>
            <UML:DataType xmi.idref = 'G.6'/>
           </UML:Namespace.ownedElement>
          </UML:Classifier>
         </UML:StructuralFeature.type>
        </UML:Attribute>
        <UML:Operation xmi.id = 'S.21'
              name = '销售' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
        <UML:Operation xmi.id = 'S.22'
              name = '购买' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
        <UML:Operation xmi.id = 'S.23'
              name = '使用' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
        <UML:Operation xmi.id = 'S.24'
              name = '维修' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
        <UML:Operation xmi.id = 'S.25'
              name = '报废' visibility = 'package'
              isSpecification = 'false'
              isAbstract = 'false' ownerScope = 'instance'>
         <UML:BehavioralFeature.parameter>
         </UML:BehavioralFeature.parameter>
        </UML:Operation>
       </UML:Classifier.feature>
      </UML:Class>
     </UML:Namespace.ownedElement>
    </UML:Package>
    <UML:DataType xmi.id = 'G.1'
          name = 'Real' visibility = 'public' isSpecification = 'false'/>
    <UML:DataType xmi.id = 'G.3'
          name = 'String' visibility = 'public' isSpecification = 'false'/>
    <UML:DataType xmi.id = 'G.4'
          name = 'Integer' visibility = 'public' isSpecification = 'false'/>
    <UML:DataType xmi.id = 'G.5'
          name = 'Date' visibility = 'public' isSpecification = 'false'/>
    <UML:DataType xmi.id = 'G.6'
          name = 'Double' visibility = 'public' isSpecification = 'false'/>
   </UML:Namespace.ownedElement>
  </UML:Model>
 </XMI.content>
</XMI>