In GeoNework (3.x), the XSL caching is enabled by default. To disable this, we can modify the following:
In the ZIP GeoNetwork version, find the file "<GeoNetwork-Directory>/web/geonetwork/WEB-INF/classes/META-INF/services/javax.xml.transform.TransformerFactory"
This file should contains the following:
de.fzi.dbs.xml.transform.CachingTransformerFactory
Change this to the following:
net.sf.saxon.TransformerFactoryImpl
Then the XSL transformation will not be cached.
Reference: http://mapas.mda.gov.br/geonetwork/docs/eng/users/quickstartguide/installing/index.html