This is the comment to the category tag:
<!-- Type of programme, eg 'soap', 'comedy' or whatever the
equivalents are in your language. There's no predefined set of
categories and it's okay for a programme to belong to several.
I think you should mention (maybe even recommend?) the ETSI 300 468 standard.
The link is:
Go to page 39
The language is English so it makes sence to have something like:
even if the (overall) language in the xmltv file is not English.
Each of them could then easily be categorized as ID 68.
The upper is just a request to a comment. For the DTD itself I suggest considering adding the following to the credits tag: