Support absolute paths in XML Associations #1056

Our Use Case is to map different files opened in VS-Code to correspondig schemas. See this issue. We therefore use the API of your XML extension.

At the moment we use the filename to indentify a opened file (we use the filename in the pattern field). However, it is possible that the user opens two files with same filename, but different paths.

Is it possible to use absolute paths in the pattern field?