scheme(+Scheme)

Set the Scheme of the URI (typically http, https, etc.)

user(+User)

Add/set the user of the authority component.

password(+Password)

Add/set the password of the authority component.

host(+Host)

Add/set the host (or ip address) of the authority component.

port(+Port)

Add/set the port of the authority component.

path(+Path)

Set/extend the path component. If Path is not absolute it is taken relative to the path of URI0.

search(+KeyValues)

Extend the Key=Value pairs of the current search (query) component. New values replace existing values. If KeyValues is written as =(KeyValues) the current search component is ignored. KeyValues is a list, whose elements are one of Key=Value, Key-Value or‘Key(Value)`.

fragment(+Fragment)

Set the Fragment of the uri.

nid(+NID)

Set the Namespace Identifier for a URN URI.

nss(+NSS)

Set the Namespace Specific String for a URN URI.

Components can be removed by using a variable as value, except from path which can be reset using path(/) and query which can be dropped using query(=([])).