I have a set of XML pages that I am developing, along with an XSL stylesheet that will render the pages to XHTML on the browser. If I use a stylesheet reference of the following form, with the XSL in the same folder as all the XML files, it works correctly:
I'm just guessing, but generally browsers frown on that "parent folder" abbreviation because it can be used to go fishing outside the web domain from which the original resource was loaded. So perhaps it's being treated as a security violation. Not sure how you would confirm that guess, though.
If the above is the correct and approved way to do it, I'll adopt it. It makes testing the site rather a hassle, since I am using Eclipse WTP and it imposes the workspace/project/WebContent structure, which goes away when the site is deployed to the webserver.