xml:base unsupported when parsing XML

[Chris Hillery]

Given an XML file foo.xml containing

  <a xml:base="http://www.oracle.com/"/>

the query

  fn:base-uri(fn:doc("foo.xml"))

should return "http://www.oracle.com/".

Likewise, the query

  import module namespace x = "http://www.zorba-xquery.com/modules/xml";
  let $d := x:parse("<a xml:base='http://www.oracle.com/'/>", ())
  return fn:base-uri($d)

should return "http://www.oracle.com/".

However, both queries return "file:///tmp/foo.xq" or whatever the path to the query file is (which is the default value for the base-uri of a new document - that's a separate issue).