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REP_ISO_LATIN_1. Storage is defined by the
BUF_*flags as described with PL_get_chars(). The flag
CVT_EXCEPTIONdefines whether or not the function fails silently or raises a Prolog exception. This function may fail because atom is not a text atom but a blob (see section 12.4.10), conversion to the requested encoding is not possible or a resource error occurs.