Rules for ID Names

• ID strings may contain letters (A - Z and a - z), digits (0 - 9), and the minus (-) sign, and must begin with a letter.

• Author-defined IDs may not use the _ (underscore character); it is reserved for IDs that are built into some HelpTag elements.

• Case is not significant, but is often used to increase readability.

• ID strings cannot be longer than 64 characters.

• Each ID within a single help volume must be unique.