In this pull request:
It was found the Dublin core class is running filter_xss twice. It doesn't really make too much sense to run filter_xss inside the Dublin Core class, since it is just for reading the XML.
Plan of attack:
1) Check if anywhere is using Dublin Core output unsanitized in all the core modules and fix anywhere that this may be the case.
2) Update the DC class to not run filter_xss.