Returns true if and only if the starting instants of the two supplied
xs:date values are the same.
xs:date values. Also used
in the definition of the "ne", "le" and "ge" operators.op:date-equal( $arg1 as xs:date,$arg2 as xs:datexs:booleanThe starting instant of an xs:date is the xs:dateTime at time
00:00:00 on that date.
The function returns the result of the expression:
op:dateTime-equal(xs:dateTime($arg1), xs:dateTime($arg2))
The expression op:date-equal(xs:date("2004-12-25Z"),
xs:date("2004-12-25+07:00")) returns false().
The expression op:date-equal(xs:date("2004-12-25-12:00"),
xs:date("2004-12-26+12:00")) returns true().