#16 two part tags can not contain double quotes

[David Förster]

Because two part tags are internally rewritten to
inline closing tags with the content added as an
attribute they can not contain double quotes.

for example:
<fs:option value="1">foo"bar"</fs:option> gets rewritten to
<fs:option value="1" tagContent="foo "bar"" /> which is
obviously invalic xml and leads to an error.