Many of the Service Attribute values in this document are strings that are used for identification of an element. The document uses a single definition for the structure of these Identifier Strings.
The length of the Identifier String is not limited; however, since it is used in human interfaces, very long Identifier Strings should be avoided.6
The allowable character set is chosen to contain printable characters since the Identifier String is used in human interfaces.7
[R7] An Identifier String MUST be a string consisting of UTF-8 characters in the range of 32–126 (0x20 to 0x7e), inclusive.
6 MEF 61.1  limits these strings to 53 octets for MEF IP Services.
7 The definition only includes printable Latin characters. Inclusion of other printable characters can be considered in a future version of the document.