This is item #1 from Greg Hudson's thread about API issues we might want to
solve before 1.0. The entire thread is here:
Probably the most useful single mail about item #1 is this, also from Greg Hudson
in which he says:
If we're pretty sure these will get into APR, we could name them
svn__apr_foo and SVN__APR_FOO, make sure there are no doxygen comments
for them, and note in the header files that they're for internal use
only. Then it should be reasonably safe to remove them from the
libraries in the future.
If we think some of them won't make it into APR, then we should pick
names we're comfortable with supporting.