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further revised RetrievalMethod

From: Donald Eastlake 3rd <dee3@torque.pothole.com>
Date: Thu, 07 Sep 2000 12:15:08 -0400
Message-Id: <200009071615.MAA08704@noah.dma.isg.mot.com>
To: w3c-ietf-xmldsig@w3.org
cc: lde008@dma.isg.mot.com

<h3>4.4.3 The <a id="sec-RetrievalMethod"

<p>A <code>RetrievalMethod</code> element within <code>KeyInfo</code>
is used to convey a <u>reference</u> to <code>KeyInfo</code>
information that is stored at <u>another</u> location. For example,
<u>several sigantures in a document might use a key verified by</u> an
X.509v3 certificate chain <u>appearing once in the document or
remotely outside the document</u>; each <u>signature's
<code>KeyInfo</code></u> can reference this chain using a single
<code>RetrievalMethod</code> element instead of including the entire
chain with a sequence of <code>X509Certificate</code> elements.</p>

<p><u><code>RetrievalMethod</code> uses the same syntax as
<code>Reference</code> except that there is no
<code>DigestMethod</code> or <code>DigestValue</code> sub-element and
presence of the <code>URI</code> and <code>Type</code> attributes is
mandatory.  <code>Type</code> is the type of the retrieved data after
any <code>Transforms</code>.  The possibly transformed referenced data
is a <code>KeyInfo</code> sub-element type or a binary X.509
certificate.  The <code>Type</code> attribute, as in Section 4.3.3, is
a URI consisting of "http://www.w3.org/2000/07/xmldsig#" suffixed with
a <code>KeyInfo</code> sub-element type, such as
"http://www.w3.org/2000/07/xmldsig#X509Data", or
"http://www.w3.org/2000/07/xmldsig#rawX509Certificate" to indicate a
binary X.509 certificate.</u></p>

<pre class="xml-dtd">
   Schema Definition:

   &lt;element name='RetrievalMethod'&gt; 
     &lt;complexType content='elementOnly'&gt;
       &lt;element ref='ds:Transforms' minOccurs='0' maxOccurs='1'/&gt; 
       &lt;attribute name='URI' type='uriReference'/&gt; 
       &lt;attribute name='Type' type='uriReference'/&gt; 

<pre class="xml-dtd">

   &lt;!ELEMENT RetrievalMethod (Transforms?) &gt;
   &lt;!ATTLIST Type 
             URI       CDATA   #REQUIRED
             Type      CDATA   #REQUIRED &gt;
Received on Thursday, 7 September 2000 12:15:15 UTC

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