+ Originally, this was used to validate both our own static
+ ZeeRex record and the records created by IRSpy, using:
+ xmllint --noout --schema zeerex-2.0.xsd zeerex.xml
+ However, it can no longer be used for this purpose, as the
+ records now carry IRSpy-specific extensions that the schema
+ does not understand. Eventually a new schema (most likely in
+ Relax NG Compact format) will be created for validation of the
+ extendd records.