<vendor id> <vendor-type (1-255)> <attribute name> [integer|tag-integer|ipv4|ipv6]|[string|tag-string|octet-string|tag-octet-string] <max-length (1-247)>]|[<[enum|tag-enum] (1-253)>=<string <max-length (1-253)>> { <(1-253)>=<string <max-length (1-253)>>}]