This string is trying to force the system to perform a specific action—in this case, using the XMLType and CHR functions to trigger a response that confirms if a certain condition is true (a "Boolean-based" or "Error-based" blind injection attempt).
It looks like the text you provided contains a specifically designed for an Oracle database. This string is trying to force the system
If you are seeing this in a URL, a search bar, or a form, it means someone (or an automated scanner) is testing the website for security vulnerabilities. Are you trying to debug a security report for a website, or a search bar