CollectionPath must be paths that match the following conditions:
CollectionPath can include paths separated by slashes.
A directory name in paths allows Unicode characters except for OS reserved filenames and the following characters: < > : " | ? * ¥0.
CollectionPath is better to be ASCII characters and case-insensitive names for cross-platform.
A directory name in paths cannot end with a period or a white space.
A directory name in paths does not allow '.' and '..'.
CollectionPath cannot start with a slash.
Trailing slash could be omitted. e.g.) 'pages' and 'pages/' show the same CollectionPath.