A domain name must be unique for all domains defined in the database and can contain a maximum of 64 case-insensitive characters from the following restricted character set:

  • a to z
  • A to Z
  • 0 to 9
  • Any of the following seven special characters: 
    # $ % & - _ .
Note: The restricted character set for domain names is the same as for domain names in E-mail domains.

The domain name can also be the empty string (""), which is reserved in OpenEdge. The empty string ("") is the value of the default (blank) domain name that OpenEdge pre-defines in every OpenEdge database. In addition, OpenEdge pre-configures and reserves additional domains whose names you cannot use to configure your own domains. For more information on these pre-configured and reserved domains, including the default domain, see Pre-configured and reserved OpenEdge domains.