Re: Of public and urn:publicid URIs

[dcpleland@ftnetwork.com]

Hi Norm;

The alternative 'matches' did not show up in what I received.

Please send so they do.

Thanks in advance,
David Leland
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ndw@nwalsh.com wrote on 5/11/01 4:54:37 PM
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Ok, let's explore what it means if we always interpret urn:publicid
URIs as public identifiers. Here's a first proposal:

In an entity resolver:

1. If you're only passed a public identifier and it's a urn:publicid URI,
   convert it to a public id and try that. If resolution fails, look
   for a public entry that matches the URI form.

     entityResolve(null, "urn:publicid:foo::bar")

   matches

     <public publicid="foo//bar" .../>

   *and*

     <public publicid="urn:publicid:foo::bar" .../>

   but prefers the former.

2. If you're passed only a system identifier and it's a urn:publicid URI,
   convert it to a public id and proceed as if you'd only been given a
   public ID.

3. If you're passed both and the public identifier is a urn:publicid URI,
   convert it to a public id and proceed. If resolution fails, look for
   a public entry that matches the URI form.

4. If you're passed both and the *system* identifier is a urn:publicid URI,
   convert it to a public id.

   a. If the two public identifiers are identical, proceed as if you'd
      only been given the public identifier.

   b. If they're different, try each in turn. As per 1.

In a URI resolver:

1. If it's a urn:publicid URI, convert it to a public id and try that.
   If resolution fails, look for a public entry that matches the URI form,
   then look for a URI entry that matches the URI form.

     uriResolve("urn:publicid:foo::bar")

   matches

     <public publicid="foo//bar" .../>

   *and*

     <public publicid="urn:publicid:foo::bar" .../>

   *and*

     <uri name="urn:publicid:foo::bar" ../>

   in that order.

Comments?

                                        Be seeing you,
                                          norm

-- 
Norman.Walsh@Sun.COM   | The greatest of all secrets is knowing how to
XML Standards Engineer | reduce the force of envy.--Cardinal De Retz
Technology Dev. Group  | 
Sun Microsystems, Inc. | 

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