打开附件中提供的book-example.xml文档，执行下列的XPath查询操作，对于下面每个查询任务，必须给出两种以上不同的查询表达式（必要时可以尝试临时修改book-example.xml文档的内容，以确保查询计划始终能够正确执行）：-Provided in the annex open book-example.xml document, perform the following XPath query operation, for each of the following query tasks, must be given two or more different query expression (if necessary you can try temporarily modify the book-example.xml document content to always be able to ensure the correct implementation of the query plan):