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If I modify apichanges.xml or similar docs in the Javadoc build target, I have to build the entire Javadoc because these docs come at the end of the process.
It could separately check up-to-date status for (1) Javadoc, (2) apichanges, (3) arch. However that would not interact smoothly with substitution of tokens in the generated files, which expects to be done as one big sweep. Maybe there is some work around. Do not plan to deal with it anytime soon though. Just make apichanges.xml edits with a DTD-aware editor (Emacs + PSGML or NB) and anyway you should be running a clean build to check your changes, which would catch the occasional problem.
e2917512ff8c implemented syntax checks for this file during every nb.org module build.