Description: A key into a help reference. This key is intended for machine usage as either a key into a database or as part of a path name to additional information. Usage: This string may be used by a management station to construct the complete URL or pathname of a file which may be stored on the management station, the managed device, a customer's server or a Xerox web server. The mechanism by which the URL or pathname should be constructed, including any requested localization, is product- and application- dependent. For example, if the device returns a string containing two path components /, a host-based management application might construct either the pathname '//.' or '///' depending on how the author wanted to organize and distribute help files for various products and locales. A web-based application with knowledge of the managed device's embedded web server might be able to construct the URL 'http:///alert-info//' and request a specific localization via the HTTP 'accept- language' and 'accept-charset' headers. Usage: Implementors SHALL use only the US-ASCII alphanumeric characters 'A'-'Z', 'a'-'z', '0'-'9' and the punctuation marks underscore ('_'), hyphen ('-'), and forward slash ('/'). The first and last characters must be alphanumeric. Implementors should note that some hosts distinguish between upper- and lower-case letters in pathnames and others don't. Therefore, different help paths should differ by more than just letter case, and product documentation MUST accurately reflect the strings returned in 'xcmHrDevAlertHelpReference', including letter case. Rationale: Limiting the character set in this way ensures that the string can be used to construct a valid pathname or URL on the widest variety of host systems. Note that the file name is not localized (although the contents may be) and not generally displayed for users, so there is little need to support characters outside of this basic US-ASCII set.