Re: [netmod] default namespace in XPath

Martin Bjorklund <mbj@tail-f.com> Wed, 07 March 2018 13:06 UTC

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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] default namespace in XPath
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Ladislav Lhotka <lhotka@nic.cz> wrote:
> Hi,
> 
> sec. 6.4.1 in RFC 7950 says in the second bullet item:
> 
>     Names without a namespace prefix belong to the same namespace as
>     the identifier of the current node.
> 
> It is unclear what "current node" means:
> 
> 1. Is it the context node of the XPath expression, or
> 
> 2. is it the schema node corresponding to the parent statement of the must/when
> statement?
> 
> For example:
> 
> module example-4-a {
>   ...
>   container bag {
>     ...
>   }
> }
> 
> module example-4-b {
>   ...
>   import example-4-a {
>     prefix "ex4a";
>   }
> 
>   augment "/ex4a:bag" {
>     when "/quux = 0";
>     ...
>     }
>   }
>   ...
> }
> 
> What is the namespace of "quux" in the when expression? Is it "example-4-a"
> (option 1 above) or "example-4-b" (option 2)?

Just like with all other unprefixed items (except in a
grouping/typedef), it is supposed to default to the prefix of the
module where it is defined (lexical scope).  So it is supposed to be
"example-4-b".  I agree that the term "current node" is misleading.




/martin