<p:add-xml-base>：添加或纠正元素的 xml:base 属性。
<p:add-xml-base>: Add or correct xml:base attributes on elements.
如果您尝试导出的模型包含这里所列的任何不支持的元素，则这些元素将标记为错误，并且必须在导出之前纠正。
If you are trying to export a model that contains any of these unsupported elements, they will be flagged as errors and must be corrected before exporting.
为了纠正这个错误，必须声明一个包含空序列的xml元素，并用这个元素将一个部分添加到消息中。
To fix this, you must declare an XML element containing an empty sequence and add a part to the message with this element. Listing 3 demonstrates how such an XML element can be declared.
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