Because access to a group is via a URL, to avoid clashes with the other aspects of the system it is important to understand the naming constraints on a group. The full group name is prefixed by the project name dash '-' (e.g. acme-docs, where 'acme' is the name of the project and 'docs' is the name of the group) and the following rules apply to the name:
None of the following characters are allowed — space, @ ,?, &, #, %, +, /
The project name can not be page, block, tree, uri, fullpage, embed, psadmin, bundle, service, error, weborganic, woconfig, servlet, psdoc, filter, group, home, member.
The project name cannot start with a number.
Because group can also be accessed via email, the following rules must also be considered when naming a group:
The name cannot contain any character prohibited in an email address
No group name can end with '-silent' or contain '--' which is used by other email switches.
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