We have alfresco repository system containing XSL files (plain XML documents). There is a need to find all invalid XSL with incorrect namespaces "http://search.yahoo.com/mrss". Trying do this with default alfresco searching box: "http://search.yahoo.com/mrss". As a result having all XSL's (both correct and incorrect). Trying to escape quotes: "\"http://search.yahoo.com/mrss\"" having "Search failed as the system was unable to process your query" error.