With the given input, this produces *exactly* the same XML as before.
- the parsing is now stricter (and thus the code more verbose). No
funny stuff, get the annotations correct.
- on parsing errors, we log now the affecting lines
- "nm-setting-ip-config.c" is a base class. Previously it was ignored
and for the moment we still do that. Next, we will allow to also
describe properties there.
- prepare the code to better preserve whitespace, indentation and line
wrappings. In particular, to honor a blank line to indicate a line break
and support paragraphs. This is not yet done to compare the output
to before, but will be turned on with a small patch next.
- the code will make it simple to promote the XML attributes to
nodes. Attributes aren't great, let's write XML nodes later.
We will only need to adjust the "keywords" dictionary for that,
but this change will require changes to the entire chain of tools.
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