math.rank(
$arg as (String | Number | Boolean | null | Array | Object)[],
$arg as xs.anyAtomicType,
[$options as String[]]
) as Number?

Summary

Returns the rank of a value in a data set. Ranks are skipped in the event
of ties. If the given value is not equal to any item in the sequence, the
function returns the empty sequence. The function can be used on numeric
values, xs:yearMonthDuration, xs:dayTimeDuration,
xs:string, xs:anyURI,
xs:date, xs:dateTime, xs:time,
and cts:point.

Parameters

$arg

The sequence of values.

$arg

The value to be "ranked".

$options

Options. The default is ().

Options include:

"ascending"(default)

Rank the value as if the sequence was sorted in ascending order.

"descending"

Rank the value as if the sequence was sorted in descending order.

"collation=URI"

Applies only when $arg is of the xs:string type. If no specified,
the default collation is used.

"coordinate-system=name"

Applies only when $arg is of the cts:point type. If no specified,
the default coordinate system is used.

## Comments