BaseX: Trying to move elements between namespaces in XQuery Update Facility

Question

I would like to normalize XSD input file to put xs: before any XSD elements without xs: prepended with XQuery.

copy $c:=doc("test.xsd")
modify
(
  if($c/schema)
  then
  (
    for $item in $c//*
    where substring($item/text(), 1, 3) != "xs:"
    return rename node $item as concat("xs:", $item/text())
  )
  else ()
)
return $c

Running this xqy on an input XSD without xs: prepended returns input file unchanged. I do update the $c and return it. So what is wrong?

input file:

<?xml version="1.0"?>
<schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<element name="note" type="xs:string"/>

</schema>

expected output:

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:element name="note" type="xs:string"/>

</xs:schema>

PS: It seems that my question causes confusion. I need xs: present because I have another text processing program which only handles elements with xs: prefix.

The things you're trying to update aren't text nodes at all, and xs: isn't a textual prefix, it's a namespace alias. So trying to match substrings of text() nodes makes no sense at all. — Charles Duffy
that is to say, what you're really trying to do, from an XML-document-semantics perspective (which is the level at which any BaseX query is working) is replacing elements in the default namespace with like-named elements in the http://www.w3.org/2001/XMLSchema namespace. — Charles Duffy
...there are actually some answers floating around on how to do that in XSLT -- see ie. stackoverflow.com/questions/9026224/… -- but I can't help you in XQUF. — Charles Duffy
(though those approaches might provide useful hints -- looking at the XQUF standard, copy-namespaces can be turned off there too). — Charles Duffy
BTW, if your document just set the default namespace to http://www.w3.org/2001/XMLSchema, then you wouldn't need xs: prefixes on everything. — Charles Duffy

Christian Grün Christian Grün · Accepted Answer · 2017-01-17T15:38:34

This should work (it’s pretty similar to your approach):

copy $doc := doc("test.xsd")
modify (
  if($doc/*:schema) then (
    for $item in $doc//*
    let $name := name($item)
    where not(starts-with($name, 'xs:'))
    let $new-name := xs:QName('xs:' || replace($name, '^.+:', ''))
    return rename node $item as $new-name
  )
  else ()
)
return $doc

BaseX: Trying to move elements between namespaces in XQuery Update Facility

1 Answers