领域信息包括领域的空间信息和文字数值信息，两者通过领域标识符id相联系。
Information of area includes the information of space and the literal and numeric information, which are related by id, i. e. identifier or area.
通常，您将存储标题字段，但不是身体领域，处理相当大的文件时，你会添加一个标识符字段(索引)，可用于检索实际的文档。
Typically, you would store the title fields, but not the body fields, when handling largish documents, and you'd add an identifier field (not indexed) that can be used to retrieve the actual document.
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