Part of the Chain.bld sample demonstrates parallel builds, and if the chained parallel builds write to the same XML log file as each other and/or the calling project, the log file will not be well-formed (since the output for the master project and each parallel child project will be interleaved in the log file). Parallel builds need to use distinct log files.
If a master project chains to a single project and waits for it to complete, both projects can write to the same log file without a problem.
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