这是一个 DAML 约定，它描述文档、确定模式（因此使用空的 rdf:about ，它将文档本身设置为主题）。
This is a DAML convention that describes the document and specifies the schema (hence the empty rdf:about, which sets the document itself as the subject).
设置文档的标题，主题，作者，关键词，造物主对加密的PD F文件(的)。
Set the document title, subject, author, keywords, creator to the encrypted PDF file (s).
此名称可能不与用来设置默认主题或对文档应用主题的字符串对应。
This name might not correspond to the string you would use to set a default theme or to apply a theme to a document.
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