Returns true if two xs:base64Binary values contain the same octet
sequence.
xs:base64Binary
values.op:base64Binary-equal( $value1 as xs:base64Binary,$value2 as xs:base64Binaryxs:booleanThe function returns true if $value1 and $value2
are of the same length, measured in binary octets, and contain the same octets in the
same order. Otherwise, it returns false.