private functions in public api?

There are double-underscored function names in include/svn_dirent_uri.h (and
in other include/*.h, too), found both on trunk and on 1.7.x, as well as in
recent beta releases. Have our naming conventions changed??

[[[
> svn cat $svnrepos/tags/1.7.0-beta3/subversion/include/svn_dirent_uri.h |
grep [a-z]__[a-z]
 * - @c svn_relpath__internal_style()
svn_relpath__internal_style(const char *relpath,
svn_uri__is_child(const char *parent_uri,
svn_relpath__is_child(const char *parent_relpath,
svn_relpath__is_ancestor(const char *parent_relpath,
svn_uri__is_ancestor(const char *parent_uri,
]]]

~Neels