Re: [xml-dev] PSVI using existing infoset items

[Eric van der Vlist <vdv@dyomedea.com>]

Henry,

Henry S. Thompson wrote:

> Eric van der Vlist <vdv@dyomedea.com> writes:
> 
> 
>>I have already tried to submit the idea a couple of times, but it
>>doesn't seem to get any echo... I'd like to give it a last chance
>>and after this, I promiss to stop pestering you!
>>
> 
> Not only is it a good idea, we've done it!  See [1].
> 
> ht
> 
> [1] http://www.w3.org/2001/05/serialized-infoset-schema.html
> 

I had a closer look and it's quite different from what I was thinking of.

Let's take a very simple example...

XML:
<foo>
   <bar>...</bar>
</foo>

XSD:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="foo" type="foo"/>
  <xs:complexType name="foo">
   <xs:sequence>
    <xs:element name="bar" type="xs:string" minOccurs="0"
      maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

The PSVI you generate is a complete serialization of the PSVI and, thus, 
very different from the original instance document:

<document xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' 
xmlns:psv='http://www.w3.org/2001/05/PSVInfosetExtension' 
xmlns='http://www.w3.org/2001/05/XMLInfoset'>
   <children>
     <element id='g1'>
       <namespaceName xsi:nil='true'/>
       <localName>library</localName>
       <prefix xsi:nil='true'/>
       <children>
         <character>
           <characterCode>10</characterCode>
           <elementContentWhitespace>false</elementContentWhitespace>
         </character>
         <character>
           <characterCode>9</characterCode>
           <elementContentWhitespace>false</elementContentWhitespace>
         </character>
         <element>
           <namespaceName xsi:nil='true'/>
           <localName>book</localName>
           <prefix xsi:nil='true'/>
           <children>
             <character>

...

What I had in mind is something that could be processed exactly like the 
original document with some information added, something such as (very 
rough draft):

<foo xmlns:...>
   <psvi:element type="complex" datatype="foo" whitespace="false"/>
   <bar>
     <psvi:element type="simple" datatype="xs:string"
         primary="xs:string"
         minOccurs="0" maxOccurs="unbounded" whitespace="false"/>
   ...</bar>
</foo>

An application could just pick the info it needs and ignore all the 
other stuff from the "psvi" namespace.

For instance, a XSLT transformation written on the source instance 
document would just need to add a template ignoring "psvi:*" to produce 
the same result on the PSVI document and could immediately take 
advantage of the psvi info (match="*[psvi:element/@primary='xs:string']" 
would match all the elements having a string primary datatype).

Eric
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Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
http://xsltunit.org      http://4xt.org           http://examplotron.org
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