Ampersand in site title breaks LTI provider cartridge XML

Login in as Admin. Create a Course. Enable 'Publish as LTI tool' at site level. Go to  Site administration > Plugins > Authentication > Manage authentication  and enable LTI. Go to  Site administration > Plugins > Enrolments > Manage enrol plugins  and enable 'Publish as LTI tool'. Go to the Course. Go to the Course Administration > Users > Enrolment methods. Add new 'Publish as LTI tool' method. 'Custom instance name' = (make sure that '&' is present in the name).' Go back to the course enrolment methods and make sure the newly added LTI method is enabled. Go to Site administration > Front page settings. Set 'Full site name' = 'fullname&' (make sure that '&' is present in the name). Set 'Short name for site (eg single word)' = 'shortname&' (make sure that '&' is present in the name). Save changes. Go to the Course. Go to Course Administration > Published as LTI tools. make sure you can see the 'testname&' LTI tool. make sure the tool is enabled. Open the 'Cartridge URL' in the browser. make sure fatal error is not being displayed. make sure the xml file is being outputted.