Google maps Google自定义搜索不会返回我使用PageMap输入的结构化数据

这是我在HEAD部分作为注释添加的页面地图

<!--<PageMap> 

                        <DataObject type="document">

                        <Attribute name="id">2067</Attribute>

                        <Attribute name="title">Empowering the Middle and Creating Workforce Readiness</Attribute>

                        <Attribute name="urlTitle">Empowering-the-Middle-and-Creating-Workforce-Readiness</Attribute>

                        <Attribute name="category">Business</Attribute>

                        <Attribute name="briefDescription">Join Stacey Harris and Stacia Garr as they share recent Bersin & Associates’ findings regarding the impact of…</Attribute>

                        <Attribute name="description">Have you given enough thought to how you are empowering the middle of your organization? The market has been focused on leveraging top talent, investing in high potentials and preparing executives. But in the midst of all this segmentation, have you thought about the engine of your workforce — your middle management and consistent performers? Over the past several years, companies have asked their employees to do more with less, increase innovation, collaborate and work globally. However, many have failed to give the middle of the organization the support it needs to succeed in today’s modern work environment. <br /><br />Join Stacey Harris and Stacia Garr as they share recent Bersin &amp; Associates’ findings regarding the impact of increasing the capabilities of line managers and the value of motivating and empowering middle performers. The discussion will include examples of how leading organizations are developing leaders from the bottom up, providing tools to help middle performers do their jobs more effectively and improving enterprise career management strategies. Specific case studies will be included in the presentation.<br /><br /></Attribute>

                        <Attribute name="startTime">2011-02-22 11:00:00</Attribute><Attribute name="presenter1">Stacey Harris</Attribute><Attribute name="presenter2">Stacia Garr</Attribute><Attribute name="host1">TM</Attribute>

            </DataObject>

        </PageMap>

        -->

使用rich snippets测试工具时……出现以下错误：“数据不足，无法生成预览。”

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有人能帮我理解为什么它不将此信息作为响应XML的一部分返回吗？

其中一个属性中包含HTML元素……这会导致XML解析失败