Method to yield an optional String according as whether this Element is an operand.
Method to yield an optional String according as whether this Element is an operand.
optionally the value of this Operand element (includes optional elements); None if this Element is not an operand.
Method to compare this Element with that Element.
Method to compare this Element with that Element.
the comparand.
the result of invoking value compare that.value
Method to determine if this Element is optional.
Method to determine if this Element is optional.
true if this Element is optional.
the String
This represents an Option Value in the parlance of POSIX.
the String