Compare the contents of this CXlArray with another
int Compare( const CXlArray& xla ) const;
A reference to a CXlArray object.
Returns 1 if the value in this object is greater than that in xla, -1 if xla is less and 0 if the two are equal.
This function acts like strcmp() and similar 'C' library functions.
Note that CXlArrays are sorted by size first and then by value.