Add MediaType IMAGE_SVG

[sgrillon14]

When you do a Web Service to Expose a svg (example: web service expose flags of the world)

in my RestControler I use this syntax:
@RequestMapping(value = "/{country}", method = RequestMethod.GET, produces = MediaType.IMAGE_SVG_VALUE)

instead of

@RequestMapping(value = "/{country}", method = RequestMethod.GET, produces = "image/svg+xml")

is more smart :)

[YanshuoShang]

yes,this is more smart

[pivotal-issuemaster]

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[sgrillon14]

I had personal licence (I'm an individual contributor)

[pivotal-issuemaster]

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[sgrillon14]

@snicoll, what do you think this PR? (is it simple change but more smart)

[snicoll]

None, otherwise I would have added a comment already.

[bclozel]

Thanks for this contribution, but I don't see this as a very common media type in Spring applications. There's no specific support for that in Spring Framework, so it's mainly about the convenience of having it in the MediaType enum already vs storing in a static attribute that media type.

Arguably, we already have a lot of those, but we should try to limit ourselves there or we're in danger of having an even larger enum.

[sgrillon14]

OK, it's a shame for the SVG because this standard is more and more used (to generate SVG side Back-End, for example flags, APP6 military symbols, games (dominos, playing cards, ...) ...