Validate metadate according to INSPIRE
I found an interesting application to check metadata validity according to INSPIRE technical guidance (PDF) here http://www.inspire-geoportal.eu/INSPIREValidatorClient/validate.do
It's an online application called INSPIRE Validator client that provides a user interface with a metadata file upload facility.
There's also an INSPIRE Validator Service that can be invoked by http request to validate Inspire Metadata (see tab "About" within the link given above.
I imagine this feature could be added quite quicky in the CATALOG...