Discard XML namespaces

In practical application, the XML fragment mixed in the code will not be too long. If it is too long, it will be stored in the file, and then read and write through the XML processing class, without processing at the syntax level. Today's vb.net introduces XML at the syntax level, which makes the parser more complex and not conducive to maintenance. The benefits from this are not great, and the language users are not easy to understand.