Strings

A string is a sequence of letters/digits and asterisks, starting with a letter. Spaces within strings are neglected.

<string>::= <letter>(<letter>|<digit>|*) (0...23)

A name string is a lexical unit, surrounded by apostrophes, that normally contains a name, in most cases of an object.

<name_string>::= '<letter>|<digit>|<special_character> (0...24)'