XQuery - does xs:string* denote a sequence?

Question

In xquery, does xs:string* denote a sequence?

eg

xdmp:document-get-collections(
uri as xs:string
) as xs:string*

Answer 1

Yes, xs:string* denotes this function returns a string sequence with zero or an arbitrary number of string items. xs:string (without modifier) allows exactly one string item, xs:string? zero or one, xs:string+ at least one item.