The DocumentTypes interface maintains a list of all available document types, where a DocumentType object is an individual document type.
DocumentTypes接口维护所有可用文档类型的列表，而DocumentType对象是单个的文档类型。
The DocumentTypes interface maintains a list of all available document types, where a DocumentType object is an individual document type.
DocumentTypes接口维护所有可用文档类型的列表，而DocumentType对象是单个的文档类型。
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