配置触发事件（触发微流，触发页面）

 <propertyGroup caption="Events">
     <property key="onChangeAction" type="action" required="false">
        <caption>On change</caption>
            <description/>
    </property>
</propertyGroup>

配置属性值

 <propertyGroup caption="Data source">
            <property key="textAttribute" type="attribute">
                <caption>Attribute (path)</caption>
                <description/>
                <attributeTypes>
                    <attributeType name="String"/>
                </attributeTypes>
            </property>
        </propertyGroup>

配置是否显示Label

<propertyGroup caption="Label">
            <systemProperty key="Label" />
        </propertyGroup>

配置是否不允许编辑

<systemProperty key="Editability"/>

配置可见性（权限）

<systemProperty key="Visibility"/>

配置调用微流并返回值

 <property key="messageMicroflow" type="microflow" required="false">
                <caption>Message Microflow</caption>
                <category>Data source</category>
                <description>Return value: the message to show.</description>
//返回类型
                <returnType type="String" />
            </property>

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