This Appendix describes the Pascal features that are implementation-defined. Identifiers Pascal restricts the maximum length of an identifier to 1,024 characters.
All characters are significant.
Identifiers in a nested procedure are concatenated with the identifier of the containing procedure. Thus, an identifier in a deeply nested procedure may become several hundred characters when concatenated and may cause problems with the compiler. Pascal generates an error when this situation occurs. Character Pascal defines the maximum range of characters as 0 to 255. Record Pascal restricts the maximum size of a record to 2,147,483,647 bytes.