also removed remark worrying about whether convertEwtsTo
should be concerned about what kind of String it returns;
no, it need not: it is just a java.lang.String which will be
treated as such and converted to an XSL String in the appropriate
encoding by the XSLT processor.
transformations. I haven't actually used it with Xalan XSLT yet, but
it ought to work if TibetanHTML did (which it must have at one point).
I do have a unit test, but an end-to-end test with Xalan is what we
need.