[media-types] Clarification about text/xml subtypes

Hi all!

I'd like to ask what might be a dumb question about text/xml subtypes. 

I notice that there are almost no registered text/xml subtypes; all of 
them seem to be subtypes of application/xml (like application/rdf+xml).

I also notice that Section 4.1.1 of RFC 2046 says that text/* types MUST 
use a CRLF sequence to represent line breaks.

This leads me to think that text/xml subtypes must use CRLF for line 
breaks, instead of simply LF. Is my understanding correct?

Also, is there a particular reason why there are no text/xml subtypes?

This all comes from a particular GitHub issue[1] about the possibility 
of registering a media type for the OPML file format[2][3], which is 
based on XML. The format currently uses either the text/x-opml media 
type, application/xml or text/xml media types. There have been proposals 
of registering text/opml+xml, or using the vendor or peronal trees, but 
seeing the lack of any registered text/xml subtype got me wondering why.

Note that I'm aware of the historical charset considerations for 
text/xml vs application/xml, but they are not what I'm confused about.

Please Cc me in replies as I'm not subscribed. Thanks! Bye :)

[1]: https://github.com/scripting/opml.org/issues/20
[2]: https://en.wikipedia.org/wiki/OPML
[3]: https://opml.org/spec2.opml

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