.TP
tokenize:string (str:string, delim:string)
Return the next token in the given str string, where the tokens are delimited
-by one of the characters in the delim string. If the str string is non-NULL,
-it returns the first token. If the str string is NULL, it returns the next
+by one of the characters in the delim string. If the str string is not blank,
+it returns the first token. If the str string is blank, it returns the next
token in the string passed in the previous call to tokenize. If no delimiter
-is found, the entire remaining str string is returned. Returns NULL when
+is found, the entire remaining str string is returned. Returns blank when
no more tokens are left.
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