[Nml-wg] xml list examples

[Guilherme Fernandes]

Hi,

On Thu, Dec 2, 2010 at 4:31 PM, Jason Zurawski <zurawski at internet2.edu>wrote:

> Hi All;
>
> On 12/2/10 4:16 PM, Aaron Brown wrote:
> > On the call, I was asked to send some examples of how we've done ordered
> lists in XML before. Looking through various xml bits, I found a few
> different ways that we've sorted lists.
> >
> > 1) a numerical 'id' element:
> >
> >           <nmwg-cp:hop id=”0”>
> >               ....
> >           </nmwg-cp:hop>
> >           <nmwg-cp:hop id=”1”>
> >               ....
> >           </nmwg-cp:hop>
> >           <nmwg-cp:hop id=”2”>
> >               ....
> >           </nmwg-cp:hop>
> >           <nmwg-cp:hop id=”3”>
> >               ....
> >           </nmwg-cp:hop>
> >
> > 2) explicit 'next' pointers:
> >
> >        <path>
> >            <hop id="internet2-1">
> >                ....
> >                <nextHop>esnet-1</nextHop>
> >            </hop>
> >            <hop id="esnet-1">
> >                ....
> >                <nextHop>bnl-1</nextHop>
> >            </hop>
> >            <hop id="bnl-1">
> >                ....
> >            </hop>
> >        </path>
>
>
> As discussed on the call one would need to have a parser that respected
> 'document order' to ensure the next sequence is correct.  Modern XML
> parsers feature this (e.g. LibXML), but its not a part of the XML
> standard itself so there is no guarantee you will find it in all
> implementations.
>
>
If an attribute/element 'firstHop' is added to the <path> element above,
respecting document order is no longer required:

<path firstHop="internet2-1">
     <hop id="internet2-1">
             ....
            <nextHop>esnet-1</nextHop>
     </hop>
     ....
</path>

Best,
Guilherme

Thanks;
>
> -jason
>
>
> > 3) implicit document ordering (this data corresponds to a traceroute.
> there would be more 'datum' elements in a real traceroute instance each of
> which corresponds to a single traceroute probe sent. This was cleaned up to
> make it easier to read):
> >
> >       <nmwg:data id="data.AAAFFF.0" metadataIdRef="meta.AAAFFF"
> xmlns:nmwg="http://ggf.org/ns/nmwg/base/2.0/">
> >         <traceroute:datum hop="198.129.254.29" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="1" value="0.135"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.219.10" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="2" value="1.14"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.217.2" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="3" value="37.212"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.209.98" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="4" value="1.616"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.220.49" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="5" value="28.643"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.209.46" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="6" value="41.773"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.221.58" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="7" value="52.36"
> valueUnits="ms"/>
> >         <traceroute:datum hop="134.55.218.101" numBytes="64" queryNum="1"
> timeType="unix" timeValue="1282079154" ttl="8" value="52.373"
> valueUnits="ms"/>
> >         <traceroute:datum hop="198.124.252.141" numBytes="64"
> queryNum="1" timeType="unix" timeValue="1282079154" ttl="9" value="52.311"
> valueUnits="ms"/>
> >       </nmwg:data>
> >
> > Cheers,
> > Aaron
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>
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