As described above, the custom fields are not defined in the document type directly; instead, they are defined in a property sheet and then added to the document type.
如前所述，定制字段不是在文档类型中直接定义的；相反，它们是在属性表中定义的，然后再添加到文档类型。
As described above, the custom fields are not defined in the document type directly; instead, they are defined in a property sheet and then added to the document type.
如前所述，定制字段不是在文档类型中直接定义的；相反，它们是在属性表中定义的，然后再添加到文档类型。
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