update
When importing a content item that already exists in the target publication, you can use this element to update the content item's source and source ID references.
Syntax
<update newsource="text"? newsourceid="text"? />
Attributes
newsource="
text"
(optional)-
The new source name to be assigned to the content item in the target publication.
newsourceid="
text"
(optional)-
The new source ID to be assigned to the content item in the target publication.