Character data type in this sentence means the character types[1] as a category, not the type character or character varying.
Yes, I understand that, but saying character confuses me a bit.
Interval is already part of the date/time types[1]
Fine.
Not really. XMLCast implements the type-specific lexical and semantic rules defined by SQL/XML, which apply only to base (non-domain) data types. Although the grammar permits a domain name as a target, the standard does not define any XML-specific semantics for domains. Supporting them would go beyond the scope of this patch, and users who need a domain can IMHO cast the XMLCast result afterward.
Correct.So maybe would be fine to explain this on SGML part, because a domain is sometimes used just as an alias of a base type, without checking or any other feature.
