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我正在description使用 docx4j 修改停靠文件的标签，如下所示：

DocPropsCorePart docPropsCorePart = wordMLPackage.getDocPropsCorePart();
CoreProperties coreProps = (CoreProperties)docPropsCorePart.getJaxbElement();
JAXBElement<SimpleLiteral> desc = coreProps.getDescription();
SimpleLiteral literal = (SimpleLiteral) XmlUtils.unwrap(desc);
if (literal!=null) {
   List<String> contents = literal.getContent();
   contents.add(0, "Scanned by AFTA. Request Code: ${scanCode}");
}
else {
   //comes here when document has no description tag
}
//save the document

但是，某些文档没有description标签。我想将描述标签添加到这些文档中。我怎样才能做到这一点？

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