Re: Separation of configuration and control - good or bad?

[Larry Menten <lmenten@lucent.com>]

Phil Shafer wrote:

> Juergen Schoenwaelder writes:
>  
> > I am talking about the filter
> > expression which you pass to get-config() to select what you are
> > retrieving.
> >    
> I think Larry was talking about using xpath for more than that.
> A snippet from his mail is attached.
>  
We use XPath for both specifying the unique target of a add, delete, 
replace,
or merge operation and for specifying the possibley multi-valued target 
of a
get operation. XPath provides a standard XML representation that can 
efficiently be
used for unique naming.  It also provides an extensible representation
for selecting multiple items for such operations as "get".   I would make
the unique naming XPath subset manditory and full XPath support optional
for large systems that can support a full XPath implementation.

> Thanks,
> Phil
>
>    <transaction id="29">
>            <deleteRequest opId="2" select="/root/configuration/protocol/ospf/area[@id='0']" />
>            <deleteRequest opId="1" select="/root/configuration/protocol/ospf/area[@id='3']" />
>            <addRequest opId="3" select="/root/configuration/protocol/ospf">
>                <area id="4">
>                    <interface id="ge-2/2">
>                        <authentication-key>
>                            <keyname>gargoyle</keyname>
>                            <key-id>3</key-id>
>                        </authentication-key>
>                        <metric>1</metric>
>                        <hello-interval>10</hello-interval>
>                        <dead-interval>40</dead-interval>
>                        <retransmit-interval>10</retransmit-interval>
>                        <transit-delay>5</transit-delay>
>                    </interface>
>                </area>
>            </addRequest>
>            <addRequest opId="4" select="/root/configuration/protocol/ospf/area[@id='2']/interface[@
> id='ge-1/5']">
>                <dead-interval>40</dead-interval>
>            </addRequest>
>            <addRequest opId="5" select="/root/configuration/protocol/is-is">
>                <area id="5"></area>
>            </addRequest>
>            <addRequest opId="6" select="/root/configuration/protocol/ospf/area[@id='1']">
>                <label-switched-path id="to-SFO">
>                    <metric>15</metric>
>                </label-switched-path>
>            </addRequest>
>            <replaceRequest opId="7" select="/root/configuration/protocol/ospf/area[@id='6']/label-s
> witched-path[@id='to-SFO']">
>                <metric>20</metric>
>            </replaceRequest>
>        </transaction>
>
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>  
Larry

--
Larry Menten               Lucent Technologies/Bell Laboratories
Phone: 908 582-4467        600 Mountain Avenue, Murray Hill, NJ  07974 USA 


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