您将使用此函数创建一个X Forms XHTML提交标记。
You'll use this function to have a submission XForms XHTML tag created for you.
如果您需要提交输入数据，使用一个带真实动作属性的标记。
If you need to submit input data, use a tag with a real action attribute.
一旦用户选择了要上传的文件，将标题和可选标记输入此表单并提交后，脚本的另一半就会发挥作用。
Once the user selects an image file for upload, enters a title and optional tags into this form and submits it, the second half of the script swings into action.
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