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CL can handle any characters in any language if the recommended UNITEXT RCP is used.

The CL script may be in either upper or lower case or a mixture. CL ignores case differences except in text (parts of the CL script enclosed in quotes). For example, CL does not distinguish between the variable names $AGE, $Age, $age and $aGe.

Blanks (spaces) in text (enclosed in quotes) are treated as characters and preserved. Elsewhere in CL, blanks have no meaning and are ignored by the compiler. They may be used as desired to improve legibility. TAB characters are treated as spaces in a CL script.