[dsdl-discuss] Re: Semantic framework for namespace processing and MNS2

From: "James Clark" <jjc@jclark.com>

> I've developed a (moderately) formal framework for describing the
> semantics of namespace processing. I've found this helpful in thinking
> about how to evolve MNS. Attached is a document describing this
> framework and sketch of my current thinking on MNS2 using this framework
> including some example MNS2 schemas. It incorporates several ideas from
> Namespace Switchboard.

Very nice.

And the idea for context to use (child-axis-only) XPath is appealing.

I wonder if it would be nice if modes had explicit declarations, which then
would provide place for syntactic sugar like "open" or "closed", since

  <anyNamespace>
    <pass/>
  </anyNamespace>
and

  <anyNamespace inModes="keep">
    <pass useMode="keep"/>
  </anyNamespace>
and

  <anyNamespace inModes="discard">
    <delve useMode="discard"/>
  </anyNamespace>

might be common idioms. For example:

<rules xmlns=http://www.thaiopensource.com/ns/mns2plus>
  <mode name="root" startMode="true" />
  <mode name="linux" closed="true" />
  <mode name="windows" closed="true" />

  <namespace ns="http://www.w3.org/1999/xhtml" inModes="root">
    <sequence>
    ...

  
Also, do people have examples where inModes has multiple modes? If it is
not common, then mode could be an element that encapsulates namespace

rules
    mode
        namespace
            validate

A mode element and a closed attribute would allow much smaller instances: e.g

<rules xmlns=http://www.thaiopensource.com/ns/mns2plusChanges >

  <mode name="stuff-in-head">
      <!-- allow XHTML's 'link', 'script' and 'style' elements -->
      <namespace ns=http://www.w3.org/1999/xhtml prune="true">
        <validate schema="xhtml-head.rng"/>
      </namespace>
      <namespace ns=http://www.w3.org/2002/06/hlink prune="true">
        <validate schema="hlink.rng"/>
      </namespace>
      <namespace ns=http://www.w3.org/1999/02/22-rdf-syntax-ns# prune="true">
        <validate schema="rdfxml.rng"/>
      </namespace>
  </mode>

  <mode name="address">
      <namespace ns=http://www.xmlns.org/2002/ContactXML prune="true">
        <validate schema="ContactXML_v1.1.rng"/>
      </namespace>
  </mode>

  <mode name="xhtml" startMode="true" closed="true" >
      <namespace ns="http://www.w3.org/2002/06/xhtml2">
        <validate schema="xhtml2-math-svg-egix-xmlcharent.rng">
          <parent name="head" useMode="stuff-in-head"/>
          <parent name="address" useMode="address"/>
        </validate>
      </namespace>
   </mode>

</rules>

Cheers
Rick Jelliffe

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