ORA-51704: Error string received from XPath engine
Cause: An error was received from the XPath library during an XPath operation.
Action: Check xmlerr.h to understand the cause of the error and correct the relevant client code.
ORA-51704：错误从XPath引擎发回
ORA-51704表示XPath引擎在执行查询语句时出现错误。此错误可能与XPATH语句中的引号有关。
1.检查XPath查询语句，尤其是引号。
2.使用XPath构造器构造查询语句，以确保XPath查询语句的准确性，以及包含足够的反斜杆。
3.检查语义正确性和逻辑正确性，以确保XPath查询语句没有任何语法错误。
4.尝试将XPath降到更简单的语句，以确保XPath引擎可以处理该语句。
如果上述操作仍然不起作用，可以联系数据库管理员或技术支持，以获得更有效的帮助。