我正在尝试在创建完整Feed之前向facebook提交示例产品目录Feed。我尝试在rss和atom中构建一个示例feed，但总是收到错误 - ＆＃34; HTML格式不受支持。＆＃34;似乎我处于一种冲动中，因为我们的其他开发人员之一说他认为看起来很好。这是一个包含一种产品的饲料片段。任何建议将不胜感激。
<feed xmlns='http://www.w3.org/2005/Atom' xmlns:g='http://base.google.com/ns/1.0'>
<title>Etrailer.com</title>
<link rel='self' href='http://www.etrailer.com'/>
<entry>
<g:id>SP01-120</g:id>
<g:title>1-1/2" Square Trailer U-Bolts (Qty 2) </g:title>
<g:description>Square Trailer U-Bolt Width: 1-1/2" Diameter: 1/2" Length: 5" Threaded portion measures 2" For 3,500-lb axles only Includes Lock Nuts 071090 Redline Square Trailer U-Bolts with Nuts and Washers</g:description>
<g:google_product_category>Vehicles & Parts > Vehicle Parts & Accessories > Motor Vehicle Parts > Motor Vehicle Towing</g:google_product_category>
<g:product_type>Trailer Suspension > U-Bolts > U-Bolt > For 1-1/2 Inch Square Axle > 1/2 Inch Diameter > 5 Inch Long</g:product_type>
<g:feature>U-Bolts U-Bolt</g:feature>
<g:link>http://www.etrailer.com/Trailer-Suspension/Redline/SP01-120.html</g:link>
<g:image_link>http://www.etrailer.com/static/images/pics/S/P/SP01-120_3.jpg</g:image_link>
<g:condition>new</g:condition>
<g:availability>in stock</g:availability>
<g:price>12.99</g:price><g:brand>Redline</g:brand>
<g:gtin>640603169157</g:gtin>
<g:shipping>
<g:country>US</g:country>
<g:service>Ground</g:service>
<g:price>4.99 USD</g:price>
</g:shipping>
</entry>
</feed>