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compared.  (The return will be undef if $update is not set).

Unless ignore_externals is set, the function recurses into externals definitions
('svn:externals') after handling the main target, if any exist.  The function
calls the notify callback with $SVN::Wc::Notify::Action::status_external action
before handling each externals definition, and with 
$SVN::Wc::Notify::Action::status_completed after each.

$changelists is a reference to an array of changelist names, used as a restrictive filter on items whose statuses are reported; that is don't report status about any item unless it's a member of those changelists.  If changelists is empty (or altoget...

The status_func subroutine takes the following parameters:
$path, $status, $pool

$path is the pathname of the file or directory which status is being
reported.  $status is a svn_wc_status2_t object.  $pool is an apr_pool_t
object which is cleaned beteween invocations to the callback.

The return of the status_func subroutine can be a svn_error_t object created by
SVN::Error::create in order to propogate an error up.

=item $client-E<gt>switch($path, $url, $revision, $recursive, $pool);

Switch working tree $path to $url at $revision.

$revision must be a number, 'HEAD', or a date, otherwise it raises the
$SVN::Error::CLIENT_BAD_REVISION error.

Calls the notify callback on paths affected by the switch.  Also invokes
the callback for files that may be restored from the text-base because they
were removed from the working copy.

Summary of purpose: This is normally used to switch a working directory
over to another line of development, such as a branch or a tag.  Switching
an existing working directory is more efficient than checking out $url from
scratch.

Returns the value of the revision to which the working copy was actually
switched.

=item $client-E<gt>update($path, $revision, $recursive, $pool)

Similar to $client-E<gt>update2() except that it accepts only a single target in
$path, returns a single revision, and $ignore_externals is always set to FALSE.

=item $client-E<gt>update2($paths, $revision, $recursive, $ignore_externals, $pool)

Similar to $client-E<gt>update3() but with $allow_unver_obstructions always set to
FALSE, $depth_is_sticky to FALSE, and $depth set according to $recursive: if
$recursive is TRUE, set $depth to $SVN::Depth::infinity, if $recursive is
FALSE, set $depth to $SVN::Depth::files.

=item $client-E<gt>update3($paths, $revision, $depth, $depth_is_sticky, $ignore_externals, $allow_unver_obstructions, $pool)

Similar to $client-E<gt>update4() but with $make_parents always set to FALSE and
$adds_as_modification set to TRUE.

=item $client-E<gt>update4($paths, $revision, $depth, $depth_is_sticky, $ignore_externals, $allow_unver_obstructions, $adds_as_modification, $make_parents)

Update working trees $paths to $revision.

$paths is a array reference of paths to be updated.  Unversioned paths that are
the direct children of a versioned path will cause an update that attempts to
add that path; other unversioned paths are skipped.

$revision must be a revision number, 'HEAD', or a date or this method will
raise the $SVN::Error::CLIENT_BAD_REVISION error.

The paths in $paths can be from multiple working copies from multiple
repositories, but even if they all come from the same repository there is no
guarantee that revision represented by 'HEAD' will remain the same as each path
is updated.

If $ignore_externals is set, don't process externals definitions as part of
this operation.

If $depth is $SVN::Depth::infinity, update fully recursivelly.  Else if it is
$SVN::Depth::immediates or $SVN::Depth::files, update each target and its file
entries, but not its subdirectories.  Else if $SVN::Depth::empty, update
exactly each target, nonrecursively (essentially, update the target's
properties).

If $depth is $SVN::Depth::unknown, take the working depth from $paths and then
describe as behaved above.

If $depth_is_sticky is set and $depth is not $SVN::Depth::unknown, then in
addition to update paths, also set their sticky ambient depth value to $depth.

If $allow_unver_obstructions is TRUE then the update tolerates existing 
unversioned items that obstruct added paths.  Only obstructions of the same
type (file or dir) as the added item are tolerated.  The text of obstructing
files is left as-is, effectively treating it as a user modification after the
update.  Working properties of obstructing items are set equal to the base
properties.  If $allow_unver_obstructions is FALSE then the update will abort
if there are any unversioned obstructing items.

If $adds_as_modification is TRUE, a local addition at the same path as an 
incoming addition of the same node kind results in a normal node with a
possible local modification, instead of a tree conflict.

If $make_parents is TRUE, create any non-existent parent directories also by
checking them out at depth=empty.

Calls the notify callback for each item handled by the update, and
also for files restored from the text-base.

Returns an array reference to an array of revision numbers with each element
set to the revision to which $revision was resolved for the corresponding
element of $paths.


=item $client-E<gt>url_from_path($target, $pool); or SVN::Client::url_from_path($target, $pool);

Returns the URL for $target.

If $target is already a URL it returns $target.

If $target is a versioned item, it returns $target's entry URL.

If $target is unversioned (has no entry), returns undef.

=item $client-E<gt>uuid_from_path($path, $adm_access, $pool);

Return the repository uuid for working-copy $path, allocated in $pool.

Use $adm_access to retrieve the uuid from $path's entry; if not present in the
entry, then call $client-E<gt>uuid_from_url() to retrieve, using the entry's URL.

Note: The only reason this function falls back on $client-E<gt>uuid_from_url is for
compatibility purposes.  Old working copies may not have uuids in the entries
files.