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1.編輯.exsd文件：（如，datafactory.exsd內容如下）
<?xml version=‘1.0‘ encoding=‘UTF-8‘?>
<!-- Schema file written by PDE -->
<schema targetNamespace="example.my.treeview">
<annotation>
      <appInfo>
         <meta.schema plugin="example.my.treeview" id="datafactory" name="Data Factory"/>
      </appInfo>
      <documentation>
         [Enter description of this extension point.]
      </documentation>
   </annotation>

   <element name="extension">
      <complexType>
         <sequence>
            <element ref="factory"/>
         </sequence>
         <attribute name="point" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="id" type="string">
            <annotation>
               <documentation>
                
               </documentation>
            </annotation>
         </attribute>
         <attribute name="name" type="string">
            <annotation>
               <documentation>
                
               </documentation>
               <appInfo>
                  <meta.attribute translatable="true"/>
               </appInfo>
            </annotation>
         </attribute>
      </complexType>
   </element>

   <element name="factory">
      <complexType>
         <attribute name="id" type="string">
            <annotation>
               <documentation>
                
               </documentation>
            </annotation>
         </attribute>
         <attribute name="name" type="string">
            <annotation>
               <documentation>
                
               </documentation>
            </annotation>
         </attribute>
         <attribute name="class" type="string" use="required">
            <annotation>
               <documentation>
                
               </documentation>
            </annotation>
         </attribute>
      </complexType>
   </element>

   <annotation>
      <appInfo>
         <meta.section type="since"/>
      </appInfo>
      <documentation>
         [Enter the first release in which this extension point appears.]
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="examples"/>
      </appInfo>
      <documentation>
         [Enter extension point usage example here.]
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="apiInfo"/>
      </appInfo>
      <documentation>
         [Enter API information here.]
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="implementation"/>
      </appInfo>
      <documentation>
         [Enter information about supplied implementation of this extension point.]
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="copyright"/>
      </appInfo>
      <documentation>
       
      </documentation>
   </annotation>

</schema>
2.plugin.xml添加擴展點：
<plugin>
   <extension-point id="datafactory" name="Data Factory" schema="schema/datafactory.exsd"/>

   <extension
         point="example.my.treeview.datafactory">
      <factory class="example.my.treeview.data.DataFactory"/>
   </extension>
  

</plugin>
3.實現(xiàn)相應的接口：