tor; however, there is a Boolean negation function, NOT, which returns 1.0 if its argument is zero, and otherwise returns zero.) Boolean operators may be used for numbers or strings. They work in the conventional way for numbers. Strings are &quot;equal&quot; if they are identical. One string is said to be &quot;less than&quot; another if it comes first in lexical order. The parse library uses localized string comparison routines to compare strings; thus, the local lexical ordering is automatically used. (F