10.16.2 Internal Names

gifs/20000000.gif The first character must be a letter (a-z, A-Z)

gifs/20000000.gif The following characters can be

a letter (a-z, A-Z)

a digit (0-9)

a pound sign (#)

an underscore ( _ )

gifs/20000000.gif An internal name can have any number of characters. Only the first 15 characters are actually used. Characters after this limit are ignored.

gifs/20000000.gif The name must not be a reserved word (see the section on reserved words).