Create an xconf file at [dspace-src]/dspace/modules/xmlui/src/main/resources/META-INF/cocoon/avalon/cocoon-core-saxon-xslt.xconf
and add the following lines:
<?xml version="1.0" encoding="UTF-8"?>
<components>
<component role="org.apache.excalibur.xml.xslt.XSLTProcessor/saxon"
class="org.apache.cocoon.components.xslt.TraxProcessor">