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What is the appropriate way to interpret URI's in the XML signed document.

From: XML DSig <xmldsig@hotmail.com>
Date: Mon, 12 Feb 2001 10:46:31 +0530
To: w3c-ietf-xmldsig@w3.org
Message-ID: <F1816Cw9fClNfnXafBZ00009606@hotmail.com>
Hi:

In the signed XML documents such as this:
-----------------
<?xml version='1.0' encoding='UTF-8'?>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
  <SignedInfo>
    <CanonicalizationMethod 
Algorithm="http://www.w3.org/TR/2000/WD-xml-c14n-20000119"/>
    <SignatureMethod 
Algorithm="http://www.w3.org/2000/09/xmldsig#dsa-sha1"/>
    <Reference URI="file:///E:/Code/XSS4JPoC/SimpleSigningPoC/personal.xml">
      <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
      <DigestValue>sNiXgt6+NHWnE+Mwn+ZZfoPPEwE=</DigestValue>
    </Reference>
  </SignedInfo>
  <SignatureValue>
    bO6TFCw+JLYDwbrMYFxW+CeJBZlDotPuDXbMu4d+Jz6tmANuGzxtAw==
  </SignatureValue>
  <KeyInfo>
    <KeyValue>
      <DSAKeyValue>

-----------------
[using IBM XSS4J]

we find there are URI's mentioned corresponding to the algorithm.

I would like to know

1) What do these URI's correspond to and what do the mean in the real life 
implementation scenario ?

2) Is it appropriate to interpret the URI's as "keys" whose values 
correspond to java "class" which is the implementation of the actual 
algorithm ?

3) There seems to be no reference to the XML Schema / DTD in the document, 
so how does one validate it ?

4) There is a reference to the XMLDSIG namespace, should the recipient 
application expect to find the XMLSchema corresponding to the XML Signed 
document at the given URI ?

I would appreciate if some members of the list would share their insight on 
this.

Thanks in advance.

-XMLDSig.

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Received on Monday, 12 February 2001 00:17:06 GMT

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