[XXE] Feature request: disable spell checking for specific elements

[Nat Pryce]

Hi.  I have a feature request for XXE.

I'd like to be able to disable the spell checker for given elements of
a doctype.

For example, when editing Docbook I'd like the spell checker to ignore
some elements, such as classname, methodname, varname, programlisting.

Ideally, that would the elements for which spell checking is disabled
would be part of the Docbook configuration.

Thanks for a great tool.
    --Nat.