Add support for specifying XML Schema attribute to output for root element

[cowtowncoder]

(note: inspired by http://stackoverflow.com/questions/21086717/how-to-convert-pojo-to-xml-with-jackson)

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It would make sense to be able to indicate that a specific XML Schema instance would be output as, say:

<TestUser xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="testUser.xsd">

for example by adding new properties for @JsonRootName

[martin-g]

+1

[richmidwinter]

+1 (although I'd like to be able to add an xsi:noNamespaceSchemaLocation without a pojo too).

[arjonamiguel]

+1

[nikolaikopernik]

+1

[wilyarti]

+1 on this. I need this for a sitemap generator in ktor.