[xmlsec] detached xml signature

[Andrew Fan]

Hi,

I suffer a error when I sign a detached xml signature. The xpath can not 
find the correct node. Why?

I use the following signature template,

<?xml version="1.0" encoding="UTF-8"?>

<Precode>
<Envelope xmlns="urn:envelope" Id="target">
  <Data>
    Hello, World!
  </Data>
</Envelope>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
    <SignedInfo>
      <CanonicalizationMethod 
Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
      <SignatureMethod 
Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
      <Reference URI="#target">
        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        <DigestValue></DigestValue>
      </Reference>
    </SignedInfo>
    <SignatureValue/>
    <KeyInfo>
    <KeyName>rsakey.pem</KeyName>
    </KeyInfo>
</Signature>
</Precode>

The error message is:
func=:file=..\src\io.c:line=423:obj=input-uri:subj=opencallback:error=7:io 
function failed:uri=xpointer(/precode/Encelope);errno=2

Thanks in advance!

Andrew