[cddlm] XML Namespaces and references.

[Steve Loughran]

Jun Tatemura wrote:
> HI
> 
> XML namespace is a source of headache, when we need to import a fragment 
> of XML from
> a document to document..
> My interpretation is that, when we say @cdl:refroot  has a QName value,  
> it should be so
> in description time, not in resolution time.  That is,  the prefix must 
> be interpreted where it is
> written.

I agree. I am starting to make an implementation notes doc in the 
documents/cdl directory on sourceforge where we can add clarifications.

> An implementation headache is that we must carry over the namespace 
> context from the original
> template.

Yes, that is what I do. when I create a reference path to resolve at run 
time, I cache the namespace declarations in scope at parse time for 
later use during resolution. The XML library I use (Xom) doesnt make 
this very public; its an O(depth*namespaces) operation for every node, 
so O(depth*namespaces*lazy nodes) for a full system.

> 
>        <cdl:cdl >
>          <cdl:configuration >
>            <p1:local xmlns:p1="http://cddlm.org/prefix1">
>              <newvalue>prefix1</newvalue>
>            </p1:local>
>            <p1:local xmlns:p1="http://cddlm.org/prefix2">
>              <newvalue>prefix2</newvalue>
>            </p1:local>
>            <node xmlns:p1="http://cddlm.org/prefix1">
>              <value cdl:ref="/newvalue" cdl:refroot="p1:local" />
>            </node>
>            <toplevel cdl:extends="node" 
> xmlns:p1="http://cddlm.org/prefix2">
>            </toplevel>
>          </cdl:configuration>
>          <cdl:system >
>            <app>
>              <user cdl:ref="value" cdl:refroot="toplevel"/>
>            </app>
>          </cdl:system>
>        </cdl:cdl>
> 
> cdl:extends at toplevel should be resolved to something equivalent to:
>            <toplevel xmlns:p1="http://cddlm.org/prefix2">
>              <value cdl:ref="/newvalue" cdl:refroot="p1:local" 
> xmlns:p1="http://cddlm.org/prefix1"/>
>            </toplevel>
> 
> 

OK