Missing mime types

[reckart]

Mime types missing from the enum:

• application/xml
• text/rtf
• text/tcf+xml (CLARIN)

... and of course I cannot generate mime-type info in the descriptors for all the DKPro Core x. types.

[pennyl67]

• the three values have been added in v2.0.2
• for the x- values, could you send them? I still have a problem with the IANA general statement that x. values should not be used; I'll discuss this also with the CLARIN standards committee.
• For the general discussion on how to treat enumerations, I'll try to solve this through the ontology, as discussed in #1 but I don't know if we have the time to do this in v2.0.2 as far as the registry is concerned,

[reckart]

Here is a list of what we currently use: https://github.com/dkpro/dkpro-core/blob/7ecebc718c4f8238401ee6b54229fa842618a0b3/dkpro-core-api-parameter-asl/src/main/java/de/tudarmstadt/ukp/dkpro/core/api/parameter/MimeTypes.java