If your document contains undeclared prefixes, then not 
only is it incomplete, but for all practical purposes it isn't an XML document. 
Which means you won't be able to process it using XPath, XSLT, or 
XQuery.
 
Michael Kay
http://www.saxonica.com/
 



  
  
  From: Robert de Wilde 
  [mailto:wilde825@p...] 
Sent: 11 June 2008 10:28
To: 
  xml-dev@l...
Subject: [xml-dev] Get all unique prefixes 
  from a XML document


  
  
  Hello,<o:p></o:p>
  <o:p> </o:p>
  I’ve created a XML document, but 
  it isn’t complete, because I’ll still need to add the namespace declarations 
  on top when the document is ready. Therefore I’d like to use XPath to get all 
  prefixes, and based on that prefixes, add the namespaces. It’s not 100% 
  correct to use fixed prefixes, I know, but it’ll solve my problem. I’ve been 
  trying to do something with namespace-uri() finding the unique ones, but it 
  didn’t work out. Can someone help me creating the right 
  query?<o:p></o:p>
  <o:p> </o:p>
  //*[     
  not(  namespace-uri() = namespace-uri(preceding-sibling::node())  ) 
      ]<o:p></o:p>
  <o:p> </o:p>
  Thanks in 
  advance,<o:p></o:p>
  <o:p> </o:p>
  Robert de 
  Wilde<o:p></o:p>